Unable to override Identity UI pages after upgrading to .Net 6 preview 4

[JamesHill3]

Describe the bug

After upgrading my .Net 5.0.7 project to .Net 6 beta 4 for testing, my overridden Identity UI pages, still located at /Areas/Identity/Pages/Account, are being ignored.

Creating a new web project and overriding the defaults using the standard Add New Scaffolded Item... does in fact create overridden pages that are respected, and places them in the exact same location as previous versions of .Net.

Deleting my login.aspx and creating it again through the UI (Add New Scaffolded Item...) generates all of the same files, includes, etc. as doing it in a new project, but the scaffolded login.cshtml is still ignored in an existing project.

My Identity UI overrides have come along through every framework update/upgrade starting with .Net Core 3 and up. Simply using SCC to roll back the .Net 6 preview 4 changes is enough to get my overridden Identity UI pages back.

Exceptions (if any)

No exceptions.

Further technical details

• .Net 6 preview 4
• Microsoft Visual Studio Community 2019 Preview Version 16.11.0 Preview 1.0

.NET SDK (reflecting any global.json):
Version: 6.0.100-preview.4.21255.9
Commit: 950e4949a7

Runtime Environment:
OS Name: Windows
OS Version: 10.0.19043
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\6.0.100-preview.4.21255.9\

Host (useful for support):
Version: 6.0.0-preview.4.21253.7
Commit: bfd6048a60

.NET SDKs installed:
2.2.207 [C:\Program Files\dotnet\sdk]
3.1.101 [C:\Program Files\dotnet\sdk]
3.1.103 [C:\Program Files\dotnet\sdk]
3.1.201 [C:\Program Files\dotnet\sdk]
5.0.100-preview.8.20417.9 [C:\Program Files\dotnet\sdk]
5.0.100-rc.1.20452.10 [C:\Program Files\dotnet\sdk]
5.0.102 [C:\Program Files\dotnet\sdk]
5.0.200-preview.20614.14 [C:\Program Files\dotnet\sdk]
5.0.202 [C:\Program Files\dotnet\sdk]
5.0.203 [C:\Program Files\dotnet\sdk]
5.0.300-preview.21258.4 [C:\Program Files\dotnet\sdk]
5.0.301 [C:\Program Files\dotnet\sdk]
6.0.100-preview.4.21255.9 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.All 2.1.28 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.28 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.16 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.0-preview.8.20414.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.0-rc.1.20451.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.0-preview.4.21253.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.28 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.3 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.16 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.0-preview.4.20251.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.0-preview.8.20407.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.0-rc.1.20451.14 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.0-preview.4.21253.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 3.1.3 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 3.1.15 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 3.1.16 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.0-preview.4.20251.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.0-preview.8.20411.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.0-rc.1.20452.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.4 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.5 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.7 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.0-preview.4.21254.5 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

[blowdart]

@HaoK can you take a look please?

(Also @JamesHill3 as an aside you have a lot of older versions on there, including old 5 previews and rcs, which should get cleaned up when you update the SDKs - are you reinstalling those?)

[JamesHill3]

@blowdart No, I'm not reinstalling. When a new version comes out I simply install, but do not manually uninstall the old version through Add/Remove programs. Are you saying they should be cleaned up automatically, or that I should be uninstalling manually?

[blowdart]

Runtimes certainly should, but as you have older SDKs they may be carried with that, and thus they're not getting uninstalled. I'd suggest having a manual cleanup of SDKs via add/remove programs, and also removing 2.2 entirely as that's not supported. Then let Microsoft Update or VS take care of putting new SDKs down. If you have multiple VS installs that may explain the 3.1.1 and 3.1.2 sdks being present.

[HaoK]

@JamesHill3 can you upload a slimmed down project where its not respecting your overridden pages to a github repo so i can try to see what the issue is?

[JamesHill3]

@HaoK During the slimming down process to prepare the solution for you, I was able to narrow down the issue to a single line of code located at /Pages/Shared/Components/ItemSpecViewer/ItemSpecViewer.cshtml:

<link href="css/ExplodedSpecComposition.min.css" rel="stylesheet" asp-append-version="true">

Simply closing this link tag allowed my overridden Identity UI pages to be respected/used

<link href="css/ExplodedSpecComposition.min.css" rel="stylesheet" asp-append-version="true" />

I'd love to say that my incredible debugging skills rooted out this bug, but given that there were no error messages or indications that would point to something like this affecting Identity UI overrides, I'm going to chalk it up to luck.

Please note that the component in question is only used on two pages in the entire site and is not associated in any way with the Identity UI overrides, the home page, or any other page that is touched during the login process.

[HaoK]

Glad you figured it out

[JamesHill3]

Glad you figured it out

@HaoK Any chance that the cause of this will be identified and fixed in .Net 6? The unclosed <link ...> did not cause overridden Identity UI pages to be ignored from .Net 5.0.7 back to .Net Core 3.0.

Because this is so difficult to track down without an error or indication of problem, it has the potential to be a real hair-puller for others.