QGIS stumbles over relative paths in project templates

[dwoe]

What is the bug or the crash?

When creating a project template with relative path specifications, the paths to the content (e.g. shapefile) are sometimes copied incorrectly. Either this template cannot be opened completely or a project based on the template contains incorrect paths.

Steps to reproduce the issue

1. in QGIS options the template path is set to "D:/Working/QGIS/Templates"
2. create a new project
3. add shapefile from "D:/Test/Shape/point.shp"
4. save as template "TestTemplate" (a qgz is created in "D:/Working/QGIS/Templates")
5. restart QGIS
6. create new project new from template "TestTemplate"
7. Message: unavailable layer

Surprisingly, the path to the included shapefile appears in 3 different places in the TestTemplate.qgz:

Versions

QGIS-Version
3.38.2-Grenoble
QGIS-Codeversion
130c432
Qt-Version
5.15.13
Kompiliert gegen Python
3.12.5
Laufendes Python
3.12.6
GDAL-Version
3.9.2
PROJ-Version
9.4.0
EPSG-Registraturdatenbankversion
v11.004 (2024-02-24)
GEOS-Version
3.12.2-CAPI-1.18.2
SQLite-Version
3.45.1
PDAL-Version
2.6.3
PostgreSQL-Client-Version
16.2
SpatiaLite-Version
5.1.0
QWT-Version
6.2.0
QScintilla2-Version
2.14.1
BS-Version
Windows 11 Version 2009

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response