Subject of single message not displaye in summary buffer

"Herbert J. Skuhra" <[email protected]> Fri, 14 Jun 2019 19:32:46 +0200
Newsgroups gmane.mail.wanderlust.general
Message-ID <874l4s9io1.wl-herbert__13624.0203444444$1560533696$gmane$org@gojira.at>
Hi,

today I received an e-mail with the following subject line:

Subject: [Reservierung#:690965]

What could be the reason that wl does not display the subject in the
summary buffer?

The following line was added to
~/.elmo/imap/server/account/inbox/entity-25:

[12577 "\"[email protected]\" <[email protected]>" "[Reservierung#:690965]"
(23811 39909) ("<[email protected]>") nil nil nil 2947 nil ((delivered-to . "[email protected]"))]

mutt/neomutt and the webmailer (Open-Xchange) display the subject correctly.

Thanks.

--
Herbert