SL12 SL11(Update11.070) certain unmixing-modules change duration of layer (silence added)

I found this with the SL11.070 Update and in SL12. GPU or CPU selection does not make a difference.
My original Audio is 24.764 Sec. long
Using UNMIX Components the target layers are 25.374 Sec. long
UNsing “Publikumsgeräusche entmischen” it blows up the length to 27.527 Sec.

Unmixing Song is OKAY. Layers have same length as orig. file.
Soundtrack-module is okay. Same length
Multi-Channel-Modul adds just a few frames (24.790)

Unmixing Lead/Back-Voc-Modul sets the length to 26.796 Sec

This came up with SL11Update 11.070

Can anyone repro the issue.?

System Win10, Intel i7 13700 .

Well, I tried unmix crowd noise and, indeed, the length of the file increases.
This is utterly screwed up, I guess.

Of course, using the precious version 12.0.0 Build 421.
I haven’t seen a worse product release for years.
Has there been any testing at all before release?
If this would have been some kind of food, the department of health would have ordered an immediate recall.

This is a problem.

I have sl12pro and SL11pro.

Comparing the both Version, Sl12 is much slower and I can not work with.

Also the AI Modules seem to isolate/unmix very randomly.

Parts of vocals miss.

Soundtrack unmixing gives not any good output and… and…