Serial Wacom device broken by Debian 12?

I finally got around to dist-upgrade my Fujitsu T5010 to Debian 12 (bookworm), but it has broken the Wacom serial stylus. My guess is that there's some boot or X setting to make it "scan" the serial port for old Wacom devices.

Here's what xinput looks like for another T5010 which is still on Debian 11 (buster):

Code:kuo@elsa:~$ xinput
Virtual core pointer id=2 [master pointer (3)]
Virtual core XTEST pointer id=4 [slave pointer (2)]
PS/2 Generic Mouse id=12 [slave pointer (2)]
SynPS/2 Synaptics TouchPad id=13 [slave pointer (2)]
Serial Wacom Tablet FUJ02e5 stylus id=14 [slave pointer (2)]
Serial Wacom Tablet FUJ02e5 eraser id=15 [slave pointer (2)]
Virtual core keyboard id=3 [master keyboard (2)]
Virtual core XTEST keyboard id=5 [slave keyboard (3)]
Power Button id=6 [slave keyboard (3)]
Fujitsu FUJ02E3 id=7 [slave keyboard (3)]
Video Bus id=8 [slave keyboard (3)]
Fujitsu FUJ02BF id=9 [slave keyboard (3)]
Power Button id=10 [slave keyboard (3)]
AT Translated Set 2 keyboard id=11 [slave keyboard (3)]and here's what it looks like on my Debian 12 T5010:

Code:kuo@rapunzel:~$ xinput
Virtual core pointer id=2 [master pointer (3)]
Virtual core XTEST pointer id=4 [slave pointer (2)]
PS/2 Generic Mouse id=12 [slave pointer (2)]
SynPS/2 Synaptics TouchPad id=13 [slave pointer (2)]
Virtual core keyboard id=3 [master keyboard (2)]
Virtual core XTEST keyboard id=5 [slave keyboard (3)]
Power Button id=6 [slave keyboard (3)]
Fujitsu FUJ02E3 id=7 [slave keyboard (3)]
Video Bus id=8 [slave keyboard (3)]
Fujitsu FUJ02BF id=9 [slave keyboard (3)]
Power Button id=10 [slave keyboard (3)]
AT Translated Set 2 keyboard id=11 [slave keyboard (3)]As you can see, the Serial Wacom Tablet FUJ02e5 stylus and eraser are missing. I'm not sure where to start trying to troubleshoot this.

Any ideas?

Thanks!