Invalid Response Fetching some messages

[toxicated101]

Some messages being fetched from online.no smtp server are throwing a Invalid Response in IMAPParser.hpp::readResponse.

The m_errorResponseLine is
*************START *******************
[^] 5882 FETCH (FLAGS (\Seen) BODYSTRUCTURE (("TEXT" "PLAIN" ("CHARSET" "utf-8") NIL NIL "QUOTED-PRINTABLE" 2 1 NIL NIL NIL NIL)("TEXT" "HTML" ("CHARSET" "utf-8") NIL NIL "QUOTED-PRINTABLE" 1257 12 NIL NIL NIL NIL) "ALTERNATIVE" ("BOUNDARY" "926efdef616cb7fe51973e212034c88e81d8901797de33e08d6042c450c3d27c") NIL NIL NIL) UID 24371 ENVELOPE ("Mon, 02 Dec 2024 11:11:51 +0000" "Kun For Deg! Få Et GRATIS Bil Nødssett Fra NAF!" (("=?UTF-8?Q?Eksklusiv=20NAF?=" NIL "marketing" "mail.iex.nl")) (("=?UTF-8?Q?Eksklusiv=20NAF?=" NIL "marketing" "mail.iex.nl")) (("=?UTF-8?Q?Eksklusiv=20NAF?=" NIL "marketing" "mail.iex.nl")) ((NIL NIL "xxxxxxx" "online.no")) NIL NIL NIL "202412021111.4B2BBp0G115507@mail119c60.megamailservers.eu"))
[response]
*************END **********************

TraceAtError.txt

[toxicated101]

It only appears to fail on some messages when fetching with attribute vmime::net::fetchAttributes::STRUCTURE, If I use vmime::net::fetchAttributes::FULL_HEADER instead I can get the message without an issue.