supplemental:

I should point out that I don't *use* Thunderbird.  I have it installed
(the one from Fedora's preinstallation, not a different "daily" one),
and can experiment with it, but I use Evolution.  Out of all the email
clients I've tried on Linux, it's the least-worst.  Not the best
recommendation, but that's how things evolved (pun intended)

Hunting around, I managed to find an email with a misidentified PDF
file attachment (as application/octet-stream).  Though I couldn't find
one with a blank space in the name.  

Evolution will open it when clicked on, just the same as a correctly
identified one (as application/pdf), in my PDF reader.  Or, perhaps I
should say that my system (Mate spin of F36) does, Evolution has no
obvious mimetype configuration options.

Thunderbird will open it when clicked on, within itself.  Likewise for
correctly identified ones.  I only get open, save-as, detach, delete
options, no open-with options, on the message reader.

If I go into the Thunderbird settings, and change PDF handling to an
external reader, it works (correctly and incorrectly identified
mimetyped files are opened externally).

-- 
 
NB:  All unexpected mail to my mailbox is automatically deleted.
I will only get to see the messages that are posted to the list.
 
The following system info data is generated fresh for each post:
 
uname -rsvp
Linux 6.1.7-100.fc36.x86_64 #1 SMP PREEMPT_DYNAMIC Wed Jan 18 18:37:43
UTC 2023 x86_64
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