I have a few issues with the undecorated windows feature that make the system up to unusable. has been tested with auto maximalize windows enabled and disable on 19.10 and 20.04
- application can be active without running process in the mate system monitor, this leads to a running undecorated application without appearance in the task bar.
- applications are not consistant in undecorating on launch. sometimes the wrong size (firefox)
- Sometimes the systen gets really slow or hangs, forcing me to do an hard reset.
workaround: set undecorate maximalized windows to the default value (disabled) in mate-tweak.