I'm trying to find out why a very old and basic CanonScan N650U flatbed usb scanner stopped working after a recent an update to sane-backends-1.1.1-r2:

Installed versions: 1.1.1-r2(09:12:17 24/02/22)(ipv6 usb zeroconf - gphoto2 -snmp -systemd -threads -v4l -xinetd ABI_MIPS="-n32 -n64 -o32" ABI_S390="-32 -64" ABI_X86="64 -32 -x32" SANE_BACKENDS="canon canon630u
genesys plustek -abaton -agfafocus -apple -artec -artec_eplus48u -as6e - avision -bh -canon_dr -canon_lide70 -canon_pp -cardscan -coolscan -coolscan2 - coolscan3 -dc25 -dc210 -dc240 -dell1600n_net -dmc -epjitsu -epson -epson2 - escl -fujitsu -gt68xx -hp -hp3500 -hp3900 -hp4200 -hp5400 -hp5590 -hpljm1005 - hpsj5s -hs2p -ibm -kodak -kodakaio -kvs20xx -kvs40xx -kvs1025 -leo -lexmark - ma1509 -magicolor -matsushita -microtek -microtek2 -mustek -mustek_pp - mustek_usb -mustek_usb2 -nec -net -niash -p5 -pie -pieusb -pixma -plustek_pp - pnm -qcam -ricoh -ricoh2 -rts8891 -s9036 -sceptre -sharp -sm3600 -sm3840 - snapscan -sp15c -st400 -stv680 -tamarack -teco1 -teco2 -teco3 -test -u12 -umax -umax1220u -umax_pp -xerox_mfp")

This scanner was able to be detected by the same user for many years now, without a problem. The user is a member of groups 'scanner' and 'plugdev',
but was NOT a member of group 'usb'. While troubleshooting I added the user
to the 'usb' group, which allowed the scanner to be detected again, but I do not understand why this sudden change in group ownership is now required. Any ideas?
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