Mail thread behavior of HTL1.5.3 after add references header

[scriptwork]

Hi, thanks for restart the HTL development.

I added references header for connecting mail thread.
But, mail thread connection worked only one time after adding references header by HTL 1.5.3.
I checked it on Thunderbird 78.14.0 on Win 11 home,

1st mail : Message ID <111>
2nd mail : Message ID <222>
3rd mail : Message ID <333>

Add "References <111>" header to 2nd mail for 2nd mail connect to 1st mail thread.

1st mail :    Message ID <111>
   2nd mail : Message ID <222> / References <111>
3rd mail :    Message ID <333>

First time connect was success.

1st mail :    Message ID <111>
   2nd mail : Message ID <222> / References <111>
3rd mail :    Message ID <333> / References <222>

But, 3rd mail can't connect to 2nd mail thread after add "References <222>" header to 3rd mail.

Please check the current behavior of the HTL.

[opto]

at the moment, I can only test in 1.5.5 on TB 91 (no changes with respect to references where this works.

I opened the edit headers, copied the messageID, closed, opened the second (third9 email and pasted it into the references.

This is for imap. May be different behaviour on pop3?

[opto]

.. and for test deleted the refrence in message 3, and then it is a separate email again

[scriptwork]

Usually, I'm using POP3 server.
And I changed the software version up to HTL 1.5.5 and TB 91.1.2
However, the issue situation remains the same.

But, Mail thread connection worked correctly on IMAP environment !
And deconnect is working with both(IMAP and POP3) environment.

Current workaround on POP3 environment is reboot TB and re-adding the same references header.