1) Open a new Word List.
2) Click Add.
3) Type in a reference.
4) Change the Bible.
>> The reference disappears.
(Though at least the dropdown with the choice I just made is helpful enough to remain.)
-- Or at least this was the sequence a day or two ago (when I may still have been on 5.2a) and first wrote this report, but waited to post it because I had encountered some other things I wanted to investigate first.
Now, however, selecting the reference from the dropdown adds an automatic execution between 3) and 4), while typing it in in full results in the helpful dropdown disappearing as well. Odd. But in both cases the main problem remains.
(Not sure I like that automatic execution. I read left to right, so the natural sequence for me is to enter the reference first and change the Bible afterwards. That makes the autoexecution a nuisance. Especially as the only way to stop it before it's finished is to close the whole panel and start anew.)