After updating I found out that ftelnet was no longer working from my website.
Logs contained
Wed Sep 6 10:13:19 2023 master/540f76d9 endofthelinebbs.com srvc 0117 WSS SendToWebSocketClientVersion7 only sent undefined of 37 bytes
Wed Sep 6 10:13:24 2023 master/540f76d9 endofthelinebbs.com srvc 0117 WSS SendToWebSocketClientVersion7 only sent undefined of 37 bytes
Wed Sep 6 10:14:12 2023 master/540f76d9 endofthelinebbs.com srvc 0120 WSS SendToWebSocketClientVersion7 only sent undefined of 141 bytes
Wed Sep 6 10:20:25 2023 master/0324ddac endofthelinebbs.com srvc 0100 WSS SendToWebSocketClientVersion7 only sent undefined of 26 bytes
I reverted to change f9dd5f4f and it's now working again.