The error occurs even without writing to the hard disk. I didn't find the exact procedure to reproduce the error, it seems to happen during mounting or unmounting, maybe only from nautilus, but even in this case I don't have the changes of the date any time. The Date doesn't change by 30 days but 1 month and there are only some files affected, but repeatedly. Even that not consistently.
On my hard drive there is only one directory and the subdirectories affected:
unmount + save remove from nautilus/mount automatically via entry in fstab, listings from terminal, from a single session on Nov 18 2020(!), here only the files "Fuga.blend1, Materials.blend1, Mixereinstellungen.vmsms" affeced - I have no idea, what the common feature may be.

sebastian@osamu:/media/4tbp/Eigene Videoprojekte/Fuga BWV 863$ ls -l
insgesamt 106752
-rwxr-xr-x 1 root root     1016 Dez  9  2020  Ablauf.txt
-rwxr-xr-x 1 root root  2990398 Dez  5  2020 'BWV 863 (I, 18 gis-moll) Selbst.mp3'
-rwxr-xr-x 1 root root  1325052 Dez 12  2020  Fuga.blend
-rwxr-xr-x 1 root root  1325148 Jul  9  2021  Fuga.blend1
-rwxr-xr-x 1 root root    73990 Dez  9  2020 'Fuga BWV 863.aup'
drwxr-xr-x 4 root root   131072 Dez  5  2020 'Fuga BWV 863_data'
-rwxr-xr-x 1 root root   231661 Dez 18  2020  Fuga_take2.aup
drwxr-xr-x 4 root root   131072 Dez 18  2020  Fuga_take2_data
-rwxr-xr-x 1 root root  4376783 Dez  9  2020 'Leuchtender Boden Cycles.png'
-rwxr-xr-x 1 root root  1185996 Dez  9  2020  Materials.blend
-rwxr-xr-x 1 root root  1185996 Jul  9  2021  Materials.blend1
-rwxr-xr-x 1 root root  2966841 Dez  9  2020  MIDI.mp3
-rwxr-xr-x 1 root root      151 Jul  9  2021  Mixereinstellungen.vmsms
-rwxr-xr-x 1 root root   249378 Dez  5  2020  Synchro.kdenlive
drwxr-xr-x 2 root root   131072 Dez 18  2020  take2_video
-rwxr-xr-x 1 root root    84884 Dez  6  2020  Test1.kdenlive
-rwxr-xr-x 1 root root 91579391 Jan  6  2021  Test1.webm
drwxr-xr-x 2 root root   131072 Dez  5  2020 'Video Test Alphaclips'
drwxr-xr-x 2 root root   131072 Dez  5  2020 'Video Test-Rohdaten'

no file used, just removed and mounted again:

-rwxr-xr-x 1 root root     1016 Dez  9  2020  Ablauf.txt
-rwxr-xr-x 1 root root  2990398 Dez  5  2020 'BWV 863 (I, 18 gis-moll) Selbst.mp3'
-rwxr-xr-x 1 root root  1325052 Dez 12  2020  Fuga.blend
-rwxr-xr-x 1 root root  1325148 Aug  9  2021  Fuga.blend1
-rwxr-xr-x 1 root root    73990 Dez  9  2020 'Fuga BWV 863.aup'
drwxr-xr-x 4 root root   131072 Dez  5  2020 'Fuga BWV 863_data'
-rwxr-xr-x 1 root root   231661 Jan 18  2021  Fuga_take2.aup
drwxr-xr-x 4 root root   131072 Dez 18  2020  Fuga_take2_data
-rwxr-xr-x 1 root root  4376783 Dez  9  2020 'Leuchtender Boden Cycles.png'
-rwxr-xr-x 1 root root  1185996 Dez  9  2020  Materials.blend
-rwxr-xr-x 1 root root  1185996 Aug  9  2021  Materials.blend1
-rwxr-xr-x 1 root root  2966841 Dez  9  2020  MIDI.mp3
-rwxr-xr-x 1 root root      151 Aug  9  2021  Mixereinstellungen.vmsms
-rwxr-xr-x 1 root root   249378 Dez  5  2020  Synchro.kdenlive
drwxr-xr-x 2 root root   131072 Dez 18  2020  take2_video
-rwxr-xr-x 1 root root    84884 Dez  6  2020  Test1.kdenlive
-rwxr-xr-x 1 root root 91579391 Jan  6  2021  Test1.webm
drwxr-xr-x 2 root root   131072 Dez  5  2020 'Video Test Alphaclips'
drwxr-xr-x 2 root root   131072 Dez  5  2020 'Video Test-Rohdaten'

...
-rwxr-xr-x 1 root root  1325148 Sep  9  2021  Fuga.blend1
-rwxr-xr-x 1 root root  1325148 Okt  9  2021  Fuga.blend1

And: 
sebastian@osamu:/media/4tbp/Eigene Videoprojekte/Fuga BWV 863$ find -newer Fuga_take2.aup -printf '%Ac %Cc %Tc %p\n'
Mo 31 Dez 1979 01:00:00 CET Sa 09 Okt 2021 18:16:36 CEST Sa 09 Okt 2021 18:16:38 CEST ./Mixereinstellungen.vmsms
Mo 31 Dez 1979 01:00:00 CET Sa 09 Okt 2021 17:12:02 CEST Sa 09 Okt 2021 20:28:58 CEST ./Materials.blend1
Mo 31 Dez 1979 01:00:00 CET Sa 06 Nov 2021 00:30:36 CET Sa 09 Okt 2021 20:30:06 CEST ./Fuga.blend1

-> last status change and last modification timestamp may change independently as in "Fuga.blend1", but not in the other two files.

Hope that information helps to find the bug.