Why don't my tag groups show in the list of tags

In one of my databases items are imported into tag groups, but these tags don’t show up in the list of tags in the sidebar. Any idea why?

Both the list of tags in the sidebar (if unified tags are enabled) and the tags group in databases (if unified tags are disabled) include only ordinary tags but not the optional group tags. But you could use a global smart group with the condition Kind is Tag instead.

So my screenshoot shows what you’d expect to see? I’m sure they used to appear there – or some of them used to.

It’s correct if “tag groups” are groups and the option Exclude groups from tagging in File > Database Properties… is disabled.