@Andrew, thanks for working on this so quickly.
I have the 3rd issue from your post.
I have since reverted back to Yosemite, but moved my High Sierra system to external drive. I've rebooted to High Sierra and installed the beta build. After a few quick tests I can confirm that it works. You're fast!
But I have a feeling that the performance is slower. When you start typing your query, there's a 1-2 seconds lag (it says something along the lines of Waiting for search results...). The stable build doesn't have that lag.