Setting a custom search option as the default search doesn't seem to stick.

I created a custom search option for the No-AI version of DuckDuckGo but Firefox seems to be periodically resetting it back to regular DuckDuckGo. I haven't been able to catch when it happens (my best guess is that it's getting reset after Firefox updates are applied but I can't test that until the next update happens) but it has happened multiple times. It stays as the default through exiting and restarting Firefox, but at some point it always seems to sneak back to using regular DuckDuckGo and I can't figure out how or why.

It isn't deleting the "DuckDuckGo No-AI" option when this happens, but it is changing the default search back to regular DuckDuckGo.