Some tags will not show when using "Reveal tag"

As title.
It happens most when the tag is in hierarchy.
As in this GIF.

Version 4 beta 3.

What kind of tag (ordinary or group tag)? And are unified tags en- or disabled, see Settings > General > Interface > Sidebar?

Group tag. The one at the bottom.

“Unified tags” is enabled.

A screenshot of Settings > General > Interface would be useful, thank you.

Here it is.

So far we couldn’t reproduce this using the same settings. Are you able to reproduce this using a new, simple database that you could share?

Yes, it’s easy to reproduce.
I set a new database up, and arranged a tag group like this:

( I made tag “a4” an aliases named “b1”)
And I created a new Markdown file name “test”, then tag it with “b1”.
I used the tag “a4” to reveal tag, and the problem happened again.

Please export this database via File > Export > Database Archive… and send it to cgrunenberg - at - devon-technologies.com. Thanks!

Done.
But I’m not sure if I sent the file correctly.