[Bug 1903805] [NEW] Thunderbird snap keeps asking to be the default email client

[Konstantin]

Public bug reported:

Thunderbird snap 78.4.1 2020-11-09 (93) 
running on Ubuntu 20.04.1 LTS

The latest version keeps asking at every start whether I want to "Use Thunderbird as the default client". I do. So I keep "Email" and "Always perform this check when starting Thunderbird" checked and click "Set as Default".
When I quit and restart Thunderbird I'm prompted the same question again.

I would expect Thunderbird to set itself as default and no longer ask
this question.

Instead, Thunderbird either fails to set itself as default or it asks
the question despite being the default (not sure how to distinguish).

** Affects: thunderbird (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Thunderbird snap keeps asking to be the default email client

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