I tried restoring to the browser instead, which worked with Mutiny just fine before, but facing the exact same issue.
My logs are full of this, hope it helps troubleshooting:
[lightning::ln::peer_handler:1465] Error handling message from 03aefa43fbb4009b21a4129d05953974b7dbabbbfb511921410080860fca8ee1f0; ignoring: Couldn't find channel for update
2023-08-01 20:44:01.971 DEBUG [lightning::ln::peer_handler:1465] Error handling message from 03aefa43fbb4009b21a4129d05953974b7dbabbbfb511921410080860fca8ee1f0; ignoring: Couldn't find channel for update