CDX8 crashes while opening a specific file


I worked on a file with CDX8 and everything was fine. Saved it and closed the file properly. Since a few months I worked on this file (I do that with a lot of other files day by day, as everybody I guess). Could always open / save and close it. Ironically I reached the final stage to open it only a few more times till it is done.

This specific file cannot be opend any more. CDX8 on 4 different PCs crashes while opening this file.
Crashing means that CorelDraw just closes and isn't seen in the task manager any more.

Last changes: -> Grouped Objects where Powercliped and multiplied

System: Win 10 (fully updated)
NET Framework: 4.8