Copy and paste doesn't work in Catalina
Pixen 4.1.1, MacOS 10.15.3
When you select a region, it very often doesn't show the whole selection and is missing the bottom half or so of the selection. If you then 'cut' the selection, the whole selection is cut away, but when you paste what you just cut, only part of it gets pasted - again missing the bottom section.
Sometimes it works, but most of the time it doesn't - I haven't been able to figure out what makes the difference.