Minor defect here - just documenting this as a FYI.
If you rename a tag, the tags do not re-sort alphabetically unless you collapse and then re-expand the tags section.
If you delete a bookmark from a tag, the number of items associated with the tag is not updated unless you collapse and then re-expand the tags section.
This doesn’t affect functionality so not that important. However, in modern applications, the expectation is that these things should be updated in real-time.