Mail duplicats - when adding tags?

Hello together,

since the last two updates (including the emoji hotfix) we are experiencing Mail duplicates.
They seem to arrive as original and when drag and drop into a tag* they got duplicated. Both are receiving the tag. From then on removing the tag and adding a tag produce new duplicates.

  • The mails are sorted and grouped by tags within the inbox. I drag and drop them from the untagged group into a tagged group.

Anyone else experiencing this? Any way to fix that?

Thanks,
Bob, The Owl