Ok. The “Ecnrypt for me” has short info too. Only “Encrypt for others” has a long info.
There is Certificate “Conny Comment” on your screenshot.
UID name: “Conny Comment”
UID comment: “This is my key”
UID Email: “foo@bar.org”
So. you cant see UID Coment in list, only in popup window.
Try add this uid in to “Encrypt to others” and you will see your comment “This is my key”