CMS Mastering Development

Entry list field get duplicated entries from specific section

I have some weird behavior when I have an entry list field (in a super table, but I get the same behavior from the native entry list field type).

When I select an entry from a certain section, it will populate 2(!) entries in that list, which point to the same entry after save. It looks correct, after I selected the entry, but as soon as I save the entry which contain the list, it gets duplicated?

Before saving:
enter image description here

After Save:
enter image description here

It only affects a single, specific section, entries from any other section is fine.

Where to even start trouble-shooting?

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