Sent messages via K9 mail when using IMAP doesn’t show up in my Sent folder, although (by default) the option to upload/save them in the sent folder is enabled and the folder mapping is automatically set to the correct Sent Items folder during setup.
Workaround: I have to manually set the mapping to exactly the same folder and then it works.
This issue is present in all my installations on several devices. I therefore assume this is a bug.
Any ideas for a root cause and a possible permanent solution?