Prusa slicer 2.5 cannot handle assemblies

[RegBurg]

Description of the bug

When importing a multi-part object the question is asked whether it should be loaded as a single object having multiple parts.
If answered as YES 2.5.0 rejects the object.
It works with the same object in 2.4.2

Project file & How to reproduce

blocks - block-1-1_2.zip

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

2.5

Operating system

windoze

Printer model

sl1s

[DragonFinlay]

It seems to be related to your model, for me this is working fine. Have you tried other multi-object models?
The file you attached only contains one OBJ which doesn't help to try and reproduce this issue.