LR communicates with my printer (Epson 3880), but won't print
I'm having a strange problem printing wirelessly to my Epson 3880 from my MacBook Pro. Prints fine when I connect directly via USB (Mac to the 3880). However, when I try to print wirelessly from LR (via an old Airport Express) it just sits on "Printing - Connected to printer." But no print (nor any change in the 3880's LCD indicating that it's receiving a print job).

I can print a test page just fine (from Utility > Print Test Page), and my MacBook Pro sees the ink levels just fine:

Here's a high-level diagram:

I've been able to print this way (from LR) in the past, but now it's not working. Since I can print a test page just fine, it seems like this is some sort of LR issue (?). But I'm not aware of any settings within LR that I could check and/or change to potentially fix this problem. Any suggestions?
LR version: Classic 12.1
OS: macOS 12 Monterey
Epson Driver: 10.90
