I've observed this behavior in v0.16.2 and v0.17.0
This isn't easily noticeable in regular use because you're normally loading a new activity after tapping a link. If you tap a link then cancel the opening of it, you will see a second dialog box reveal itself from behind the first.
Steps to reproduce:
Confirmed
Cannot reproduce with 0.19.8.
I can't reproduce, either. Can you @Gymcap confirm this has been fixed?
I remember testing this and seeing two Open With dialogues, one behind the other revealed on a back press. Just tested and this is gone for me now. We'll reopen if Gymcap can confirm it still exists.