ID 512151 - Grouping a Paint node deletes the paint data

Problem summary
Grouping a Paint node deletes the Paint data
 
Customer reported version
Mari 5.0v3
 
Customer reported platform
Multiple
 
Steps to reproduce
 
1) In any project, create a Paint node

2) Bake some paint

3) Group the Paint node (CTRL+G)
 
4) Dive inside the Group and view the Paint node
 
Expected behaviour
The Paint data should be retained.
 
Actual behaviour
The Paint data is deleted.
 
Workaround
Unknown.
 
Reproduced by support
This bug has been reproduced in:
Mari 5.0v3 - Windows 10 - CentOS 7.9
Mari 4.8v3 - Windows 10
Mari 4.8v1 - Windows 10 - CentOS 7.9 - regression
 
Unable to reproduce bug in:
Mari 4.7v7 - Windows 10 - CentOS 7.9
 
Earliest version tested
Mari 4.7v7 - This issue doesn't appear in this version and has regressed