@peabee, @dimkr
The clipboard in Jammy64 behaves weirdly; weirdly as in not being able to copy images, and forgetting the copied text after closing the application from which it was copied. Also, the current clipboard manager (if there is any) does not show clipboard history on the task-bar.
My suggestion is to use the package Diodon (see also ubuntu packages - diodon) in Jammy64. I've currently tested this on Jammy64's live install by installing it with apt. Requires additional changes in the settings to allow copying images, but that can be handled easily.
If my suggestion gets approved, I can start adding this to Jammy.