Not all Tags listed in Tag Summery

Hi,

I've the problem when creating any tag in my notes and want to list them with the "Find tags" in the Tag Summery I only get some tags listed in my Workingbook. For example I only get Tasks that are shown on the currently opened page but not other tags from that page or any other tags from other Pages/Groups or even the whole Workingbook regardless what filter for searching is set. (See also attached image)

Are there any setting that I've to change?

Hope someone can help me.

Greetings

Alex