Windows 10 Start-Search not behaving well

I do some similar things (put shortcuts in the start menu for quick "Win+S..type name (or few chars) of shortcut..press enter" ways of loading programs and scripts). I haven't noticed any problems with the new update, but here are a couple of things I would try in your case:

1) Make a backup of the folder that contains your shortcuts. Delete it and restart the computer. Then copy it back in (and possibly rename it). The thinking here is it might help the search index to rebuild itself.

2) Add the folder to your PATH. Here is a link on how to do it if you need to know how: How do I set system environment variables in Windows 10?