Hi,
Thank you for the detailed video!
I cross checked the search query files, but there was no (significant) change in that area, so this issue is very likely linked to something else as well, but I can not replicate it.
It is going to be something in the configuration + a change somewhere else in the code, but I don’t know where to look.
Can you add temporary (s)FTP and back-end access? The only way I could get to this very quick is to first debug the old query and compare it to the new one with your specific configuration. There must be a difference in the query, and that will eventually lead me to the problem.