Symbology using relations does not propagate in QGIS Server

[NyakudyaA]

Problem

I have a QGIS project with a relations setup. One of the tables is set up with the styles using relations

The style that appears in QGIS looks like

The corresponding wms from QGIS Server looks like

PS: I am not sure if it's a bug or a feature request. I will try to setup a demo project and share.

I am using QGIS Server 3.10 and 3.12 in docker

[elpaso]

At first sight, it smells like a bug to me...

[elpaso]

@NyakudyaA ping me when the test project is ready.

[NyakudyaA]

@NyakudyaA ping me when the test project is ready.

Ping @elpaso
bug-issue.zip

[elpaso]

@NyakudyaA I just opened your project but I can't see any issue: WMS is on the right, local project on the main map:

[NyakudyaA]

@NyakudyaA I just opened your project but I can't see any issue: WMS is on the right, local project on the main map:

@elpaso what setup do you have there. Which QGIS Server version are you using.

[rldhont]

Bugfix has been done around relation in QGIS Server #33476 and #33557 Relations used QgsProject.instance() but it's has been fixed

[NyakudyaA]

@elpaso I have just tried this with a different qgis server image and it actually returns the proper image. So this must be a specific implementation of QGIS Server from lizmap that has a bug. I will report it to them to investigate.