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.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to ubuntu-meta in Ubuntu.
https://bugs.launchpad.net/bugs/1872504

Title:
  date modified is wrong for files on an exfat formatted drive

Status in ubuntu-meta package in Ubuntu:
  Confirmed

Bug description:
  When using exfat formatted drives (e.g. my camera card) with focal
  fossa any access causes the date modified to be set, even when it
  would not normally be set, and it is set a month into the future.

  Installing exfat-fuse and exfat-utils results in the correct
  behaviour.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.18
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  ApportVersion: 2.20.11-0ubuntu26
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Apr 13 17:27:30 2020
  InstallationDate: Installed on 2020-04-12 (1 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200409)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: dist-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)

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