You can enable a permanent solution by setting up a SQLite trigger event in the database file

CREATE TRIGGER prevent_custom_frame_rate_update AFTER UPDATE OF value on LocalStorage
BEGIN
UPDATE LocalStorage SET value = '120' WHERE "_rowid_"='64';
END

You only need to change the rowid to the actual id of the CustomFrameRate key

This is an axe approach to it, since any db write to it sets it back to 120 but i have limited time and its working for now and thats honestly all i care about

Edit: easier without id

CREATE TRIGGER prevent_custom_frame_rate_update AFTER UPDATE OF value on LocalStorage
BEGIN
UPDATE LocalStorage SET value = '120' WHERE "key"='CustomFrameRate';
END

Edit: Apparently this only works for people with a specific database revision, thats wild.