Dibl, what i do not understand, why your system is using ifupdown still?
And your USB problem seems even not kernel related.
Here:
[Di Jul 20 13:21:54 2021] usb 1-3: new high-speed USB device number 2 using xhci_hcd
[Di Jul 20 13:21:54 2021] usb 1-3: New USB device found, idVendor=ffff, idProduct=5678, bcdDevice= 2.00
[Di Jul 20 13:21:54 2021] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[Di Jul 20 13:21:54 2021] usb 1-3: Product: Disk 2.0
[Di Jul 20 13:21:54 2021] usb 1-3: Manufacturer: USB
[Di Jul 20 13:21:54 2021] usb 1-3: SerialNumber: 9207316297209129120
[Di Jul 20 13:21:55 2021] usb-storage 1-3:1.0: USB Mass Storage device detected
[Di Jul 20 13:21:55 2021] scsi host2: usb-storage 1-3:1.0
[Di Jul 20 13:21:55 2021] usbcore: registered new interface driver usb-storage
[Di Jul 20 13:21:55 2021] usbcore: registered new interface driver uas
[Di Jul 20 13:21:56 2021] scsi 2:0:0:0: Direct-Access VendorCo ProductCode 2.00 PQ: 0 ANSI: 4
[Di Jul 20 13:21:56 2021] sd 2:0:0:0: Attached scsi generic sg2 type 0
[Di Jul 20 13:21:56 2021] sd 2:0:0:0: [sdc] 61440000 512-byte logical blocks: (31.5 GB/29.3 GiB)
[Di Jul 20 13:21:56 2021] sd 2:0:0:0: [sdc] Write Protect is off
[Di Jul 20 13:21:56 2021] sd 2:0:0:0: [sdc] Mode Sense: 03 00 00 00
[Di Jul 20 13:21:56 2021] sd 2:0:0:0: [sdc] No Caching mode page found
[Di Jul 20 13:21:56 2021] sd 2:0:0:0: [sdc] Assuming drive cache: write through
[Di Jul 20 13:21:56 2021] sdc: sdc1 sdc2
[Di Jul 20 13:21:56 2021] sd 2:0:0:0: [sdc] Attached SCSI removable disk
pmount /dev/sdc2
/dev/sdc2 on /media/sdc2 type vfat (rw,nosuid,nodev,noexec,relatime,uid=1000,gid=1005,fmask=0177,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,quiet,utf8,errors=remount-ro,user)
towo@lenovo:~$ uname -a
Linux lenovo 5.13.3-3-siduction-amd64 #1 SMP PREEMPT siduction 5.13-3.2 (2021-07-20) x86_64 GNU/Linux