libcupsfilters-2.2.1-4.4 breaks compatibility

I am using CachyOS. Since the latest upgrade of the library I am no longer able to print. CUPS Server http://localhost:631displays the last successful print at Sat 29 Aug 2026 01:48:21 PM -05 . Since then the page displays the error Idle - "universal filter failed."

The output of /var/log/cups/error_log contains:

D [09/Sep/2026:11:01:09 -0500] cupsdIsAuthorized: requesting-user-name="gavox"
D [09/Sep/2026:11:01:09 -0500] [Client 2] Returning IPP successful-ok for Get-Notifications (/printers/) from localhost.
D [09/Sep/2026:11:01:09 -0500] [Client 2] Content-Length: 127
D [09/Sep/2026:11:01:09 -0500] [Client 2] cupsdSendHeader: code=200, type="application/ipp", auth_type=0
D [09/Sep/2026:11:01:09 -0500] [Client 2] con->http=0x558ee336e840
D [09/Sep/2026:11:01:09 -0500] [Client 2] cupsdWriteClient error=0, used=0, state=HTTP_STATE_POST_SEND, data_encoding=HTTP_ENCODING_LENGTH, data_remaining=127, response=0x558ee3499830(IPP_STATE_DATA), pipe_pid=0, file=-1
D [09/Sep/2026:11:01:09 -0500] [Client 2] Writing IPP response, ipp_state=IPP_STATE_DATA, old wused=0, new wused=0
D [09/Sep/2026:11:01:09 -0500] [Client 2] bytes=0, http_state=0, data_remaining=127
D [09/Sep/2026:11:01:09 -0500] [Client 2] Flushing write buffer.
D [09/Sep/2026:11:01:09 -0500] [Client 2] New state is HTTP_STATE_WAITING
D [09/Sep/2026:11:01:09 -0500] [Client 2] Waiting for request.
D [09/Sep/2026:11:01:09 -0500] cupsdSetBusyState: newbusy="Dirty files", busy="Active clients and dirty files"
D [09/Sep/2026:11:01:10 -0500] Expiring subscriptions...
D [09/Sep/2026:11:01:25 -0500] [Client 298] HTTP_STATE_WAITING Closing for error 32 (Broken pipe)
D [09/Sep/2026:11:01:25 -0500] [Client 298] Closing connection.
D [09/Sep/2026:11:01:25 -0500] cupsdSetBusyState: newbusy="Dirty files", busy="Dirty files"
D [09/Sep/2026:11:01:25 -0500] Expiring subscriptions...

The printer is recognized by the kernel,

lsusb gives

Bus 001 Device 014: ID 04b8:005e Seiko Epson Corp. EPSON L120 Series

And this is not a permission issue, as:

ls -l /dev/bus/usb/001/014 
crw-rw-r-- 1 cups lp 189, 13 sep  9 11:10 /dev/bus/usb/001/014

After following the advice on cachyos forum
https://discuss.cachyos.org/t/printer-problems/35056
I decided to roll back to the previous version of the library, and the printing came back. Therefore I think there is something in this version of the library that breaks compatibility.

Start by reproducing the printing failure with libcupsfilters 2.2.1-4.4 and the previous library version, using the universal filter error and /var/log/cups/error_log as the initial evidence. Check the Epson L120 USB setup described in the issue; done means printing works with the newer library or the compatibility regression is isolated.