Incompatiblity with Assembly4?

[johnsonm]

When I created a single-document Assembly4 collection in which all the bodies were in a single document, it works fine. For example, see https://gitlab.com/mcdanlj/KeywayCutter

However, if I create individual parts, and add Link to Part. it works only within that session. After saving all the files, though, if I try to re-open the Assembly4 document, I get errors and broken links:

<App> PropertyContainer.cpp(479): Document parsing error
In context: |Bracket|ExpressionEngine while parsing SnatchBlock#Bracket.ExpressionEngine
<Base> Reader.cpp(811): Reading failed: /.../Documents/Machining/SnatchBlock/SnatchBlock/Bracket.xml
<App> PropertyContainer.cpp(479): Document parsing error
In context: |BracketMirror|ExpressionEngine while parsing SnatchBlock#BracketMirror.ExpressionEngine
<Base> Reader.cpp(811): Reading failed: /.../Documents/Machining/SnatchBlock/SnatchBlock/BracketMirror.xml
<App> PropertyContainer.cpp(479): Document parsing error

This happens whether the target files are "Save as Directory" or FCStd files.

Here's the associated saved files in directories.
https://gitlab.com/mcdanlj/SnatchBlock/-/tree/a9b53a69f1d417b80e2ea6eaafa2525fdfa79983

Same in FCStd files for all the referenced parts:
https://gitlab.com/mcdanlj/SnatchBlock/-/tree/91641923d9234fbb8c59752e895c9675b717a2ef

However, if I save the assembly as a FCStd file and rebuild it in the current 0.20 appimage from upstream FreeCAD, it works:
https://gitlab.com/mcdanlj/SnatchBlock/-/tree/fd77a71c5b5fa9448f3c55ad82842237643f430a

Is this just "need to merge LinkStage up to 0.20 and do a new release"?

[johnsonm]

This problem persists with the latest update to FreeCAD-asm3-Daily-Conda-Py3-Qt5-20220704-glibc2.12-x86_64.AppImage only when using "Save to Directory" — it reads an FCStd file correctly, at least at the latest version of that part.

OS: Fedora Linux 36 (Thirty Six) (GNOME/gnome)
Word size of FreeCAD: 64-bit
Version: 2022.704.26244 +4971 (Git) AppImage
Build type: Release
Branch: LinkDaily
Hash: a87320cc64699a8e4226bad2e9b37ac3a1296ab9
Python version: 3.9.13
Qt version: 5.12.9
Coin version: 4.0.1
OCC version: 7.5.3
Locale: English/United States (en_US)