XenForo Error when adding items to the Censoring list

[tpmedia]

When I try to add items to the Censor list I get the error:
Oops! We ran into some problems. Please try again later. More error details may be in the browser console.

We have 200-300 items in the list and it has worked up until recently.

Xenforo 2.2.16
Server details
PHP version 8.3.8
MySQL version 10.3.31 (10.3.31-MariaDB-0ubuntu0.20.04.1)
Server software Apache/2.4.41
PHP memory_limit 128M
PHP post_max_size 8M
PHP upload_max_filesize 2M
PHP max_input_vars...

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