I include links to the documentation from the very 1st answer. But it seems that you ignore them for some reason. Please open this thread on site in a browser and go to the documentation links provided. Then ask questions if you will still have them.
Searching/filtering adds new arguments/parameters to URL. When you use “Block not selected” model, only apparently selected menu links are allowed. The same link with additional argument(s) is counted as not selected, and thus, blocked. Take into account that “Block not selected” model is more restrictive comparing to the “Block Selected”, where URE block only links which you selected and does not decide itself what to block.