bug#59942: 29.0.60; gnus-summary-move/copy-article do not move/copy attachment

[Konstantin]

I am using Gnus with IMAP backend. By default, I do not fetch attachments:

nnimap-fetch-partial-articles "text/"

Nevertheless, I expect that an article should be moved or copied to
other group with its attachment
"B m" (gnus-summary-move-article)/ "B c".
It is not the case. Is it a bug or a feature?

Things get more complicated when i fetch attachment prior to the move/copy.
An article is copied with an attachment and is moved without an attachment.