I run

        dovecot --version
                2.3.17.1 (476cd46418)

on

        lsb_release -rd
                Description:    Fedora release 35 (Thirty Five)
                Release:        35

mail store is maildir

        mail_location = 
maildir:/data/vmail/%d/%n/Maildir:CONTROL=/data/vmail/%d/%n/_control:INDEX=/var/vmail-index/%d/%n:LAYOUT=fs:UTF-8

front-end client is

        thunderbird --version
         Thunderbird 91.7.0

also on

        lsb_release -rd
                Description:    Fedora release 35 (Thirty Five)
                Release:        35

mail is delivered to the store via lmtp transport from a Postfix agent

mail, with attachments (e.g., .PDF) is received OK
it's readable, attachments can be opened and/or saved to disk\

if, in TBird client, i move the message to any other folder in the IMAP 
hierarchy, the message relocates, as expected.

the message itself is still readable, and _appears_ to have the attachment.

but, attempting to OPEN the *attachment*, with e.g. Okular, from within the 
relocated message pops up a dialog,

        "Could not open file:///tmp/pid-28435/manual_13542AE.pdf"

and saving it to Desktop,

        ls -al manual_13542AE.pdf
                -rw-r--r--   1 pgnd pgnd   27 Apr  1 06:01  manual_13542AE.pdf

        file manual_13542AE.pdf
                manual_13542AE.pdf: data
then opening it similarly returns

        "Could not open file:///home/pgnd/Desktop/manual_13542AE.pdf."

Moving the message, via TBird, **BACK** to the Inbox, cures the problem --
-- I can immediately, again, open & save the attachments.

This 'feels' like cache management misconfiguration to me.  Not sure whether in 
Tbird &/or Dovecot, or what to look for specificially.

Hints as to cause/fix of this attachment issue?  Or event what/where, 
specifically, to log?

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