Mp4: No longer any tag changes supported

As of today, i could no longer edit any tags for mp4 files, downloaded with the latest Audials22. mp3 is ok.
I installed also the latest mp3tag - still no change. When saving any tag changes, the message comes up that the file could not be written. Subsequently there is a tmp file in the folder for each file for which write was tried.

I only have Windows defender active.

Running M3Tag [2022-01-21] REL: VERSION 3.12 (for Windows 11/10/8.1/8/7)

Prozessor Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz 2.70 GHz
Installierter RAM 8,00 GB (7,87 GB verwendbar)
Geräte-ID AED338AA-27E5-4B0E-BDF3-0310BEB4122F
Produkt-ID 00325-80679-88480-AAOEM
Systemtyp 64-Bit-Betriebssystem, x64-basierter Prozessor
Stift- und Toucheingabe Für diese Anzeige ist keine Stift- oder Toucheingabe verfügbar.
Edition Windows 10 Home
Version 21H1
Installiert am ‎31.‎08.‎2020
Betriebssystembuild 19043.1466
Leistung Windows Feature Experience Pack 120.2212.3920.0

Mp3tagError.log:

================================================================================
Mp3tag v3.12 - 02.02.2022 - 11:22:27
--------------------------------------------------------------------------------
OS-Version: Windows 10 (build 19043), 64-bit
--------------------------------------------------------------------------------
Build: Jan 21 2022 11:44:15
--------------------------------------------------------------------------------
AppPath:  16.964.046.848 Bytes frei (C:\Program Files (x86)\Mp3tag\)
DataPath: 16.964.046.848 Bytes frei (C:\Users\svd\AppData\Roaming\Mp3tag\data\)
TempPath: 16.964.046.848 Bytes frei (C:\Users\svd\AppData\Local\Temp\Mp3tag v3.12\)
================================================================================

--------------------------------------------------------------------------------
MESSAGE
--------------------------------------------------------------------------------
File:		y:\projects\_audio\smp4file.cpp
Line:		566
Message:	write: invalid or incomplete data (D:\Videos\Audials\Audials Other Videos\Facts der Impfpflicht-Befürworter.mp4)
00007764 at 0:09.061903
--------------------------------------------------------------------------------
MESSAGE
--------------------------------------------------------------------------------
File:		y:\projects\_audio\smp4file.cpp
Line:		566
Message:	write: invalid or incomplete data (D:\Videos\Audials\Audials Other Videos\Facts der Impfpflicht-Befürworter.mp4)
00007764 at 0:26.735796
--------------------------------------------------------------------------------
MESSAGE
--------------------------------------------------------------------------------
File:		y:\projects\_audio\smp4file.cpp
Line:		566
Message:	write: invalid or incomplete data (D:\Videos\Audials\Audials Other Videos\Facts der Impfpflicht-Befürworter.mp4)
00007764 at 0:27.787609

Have you checked the files for consistency?
See suggestions for tools here:

You probably need Foobar2000 to check mp4 files.

Did you convert the files with some kind of online service?
Then it is fairly likely that you got files with an invalid format back.

Any solution here? I´ve got the same issue...
Checked all files and they seem to be ok. While MP3 tags can be written, MP4 tags can not written any more.

As you can see, the OP did not answer.
What have you done in to narrow down the problem, esp. following the