undo (ctrl-z) is very unreliable, looses data
Not sure why it's different than the system functions of undo/redo but it is very unreliable. Haven't found a great way to replicate it, but it does appear to have a limited number of undo's available (maybe 30?) which seems less than typical system limits. Also it appears to have the hardest time when pasting in images or charts in HTML format.
Version: 3.32.4 (3.32.4-1.fc30)