Window surfaces go missing after reindexing

[Stefan Videnov]

Hallo,
We've migrated a big project from 27 to 29. We're still using 27 libraries. Apart from an attribute nightmare I am now experiencing the following problem:

I am reindexing a texture "_L1.2 gevelkozijn" from index 14 to index 11002.

As a result all Windows loose the assigned texture and I have to manually set it up again.

The walls are unlocked, their layer is unlocked, I have also reserved everthing, also during reindexing I get no error warnings (which do appear if something is not accessible)

I thought Reindexing automatically relinks all elements in the project.

Any ideas?

Thank you!

Operating system used: Windows 11