raspberry pi – CUPS stuck on “Processing page 1…” – Brother HL-L2300D

I have a Brother HL-L2300D that I bought used. I have it connected by USB to a Raspberry Pi running CUPS, with the printer driver from printer-driver-brlaser. I can send jobs to the printer, but they never get past a State of “Processing Page 1…” until eventually, maybe hours later, they disappear from the job queue and don’t show in Completed Jobs or All Jobs. The printer also never makes any noises or changes its LED pattern to indicate it’s trying to do something.

What can I do to figure out why it’s getting stuck?