Hi Jelk,
Thank you for the proper description!
You have stumbled upon a very rare, known bug, which affects the current release. Basically if only custom fields are selected as a search source, the search sometimes does not trigger correctly. I’ve already identified this issue and will roll out a release after the holydays.
As a temporary fix, I have enabled the “Search in permalinks” option on the General Options -> Sources panel, to trigger the search correctly and search the selected custom fields as well. I’ve choosen this option, because it has the least effect on the expected results.
Best,Ernest Marcinko
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