entries appear duplicated when searching

(I've posted that already as a follow-up on a closely related thread, but I didn't receive a reply yet and I can't reply to it further, so I re-post it here in its own thread.)

First, where to find the data that proves the bug:

- bibfile: https://bercher.net/bibtex/bibliography.bib
- page with search field: https://bercher.net/my-publications/all-publications

Bug description:
When some works have the same title and authors (but different venues, e.g., first a workshop and then they turn into a conference, or they are first a conference and then there's an extended tech-report), then:
- they first appear *correct* in the publication list, *but*
- once *any* search was used, they become duplicated.

How to verify that bug?
- Open the webpage above and *without using the search* navigate down to 2008. You will see two different entries:

- Now use the search. Type anything, doesn't matter! Then delete it again

- To have a second example, you can also check out the papers with keys Johnson2022aSATPruning and Johnson2022bSATPruning; this gives the same behaviour.