Originally reported in #core-editor by @talksina, there's a bug with the navigation block in Gutenberg 18.2 where, when trying to search to add additional blocks, the inserter disappears. cc @alexstine for tagging me to investigate.

Steps to replicate

1. Create a navigation block, no matter if in post, page or template.
2. Add a new menu item. "add block", the block inserter pops up.
3. Click on "browse all blocks"
4. Type a desired block name in the search field.
5. The inserter closes, without adding anything.

I can replicate both with clicking and via keyboard navigation.

Video

Environment

GB 18.2, WP 6.5.2, TT4