fid03 This was a bug in pseudo-locale usage and it was fixed some months ago.
Yes indeed, but of course it was. But it had to go through soft bricking a number of users before it got fixed, and these users, some of which factory resetted as a result, all of them got that normal UI settings option available since running dev options enabled.
The case is a perfect lesson since it covers several aspects at once;
-Effectively lock-out for users and forcing factory resets.
The normal UI got affected from Developer Options, Rowhammer-like
No changes needed to be done in the Developer options, just them being enabled was enough to cause the thing.
Since new unfinished innovations shows up in the developer options on a recurring basis, and the above thing needed sacrificing users installed OS:es, this may happen again. Who knows what toggling the new 'adjust cursor blink rate'-option conflicts with in the normal UI? Maybe nothing but I don't know, since the above situation was possible even though it should not have been.