I created several blocks a few months ago and they all worked well.
Today I went to create a new block, but it will not show up in the widget block search.
All older blocks are showing up, and the new block also shows up in the posts/page editor when I search for it. See: Olyweb Quicklink Block shows in the post search.
I have tried duplicating older blocks (changing the name and slug), and they will not register in the widget block search either.