AME keeps MXF files with XAVC in access, source files cannot be deleted

Dear community,

maybe you can help me out with my issue.

I am using AME (currently 2023.2.1) in 4 instances, each running on DL360 with an nVidia P1000 hardware, overall running pretty smoothly. The encoders are orchestrated by Helmut4 IO by Moovit which assigns each instance its encoding jobs.

When encoding is done or failed, the source files are moved to a folder, either "processed" or "unprocessed". Since some time now, some MXF files are kept AME so that they cannot be moved or deleted, though the encoding process is finished - this leads to a whole bunch of files in the watchfolder. Other filetypes like MP4, MOV, MPG and so on are doing fine.

The only way to move or delete the files is to close the AME app - even a restart of the AME doesn't help here, the files are still kept from deletion by AME after a restart.
As closing, moving the file and reopening the application after each transcoding takes a bit of time, I'd like to have it the way it was. Nothing unusual in the AME logs.

UPDATE: I have narrowed it down to MXF files with Sony XAVC codec, e.g. produced by FX6 / FS7 / FX9 which cause the trouble.

Kind regards

Silvan