The open/save dialog cannot be used to select files containing # characters. Selecting existing file will result in an error (file not found, but dialog shows full path to it), attempting to save a new one will strip the name of everything after and including the first # character. If # is the first character, the dialog will behave as if the directory path had been entered instead. Looks to me like it is treating the file paths as URIs and anything after a # is effectively stripped off as optional fragment. OS: openSUSE Tumbleweed (20201108) KDE Plasma Version: 5.20.2 KDE Frameworks Version: 5.75.0 Qt Version: 5.15.1
Fixed in Frameworks 5.76. Sorry for the breakage. *** This bug has been marked as a duplicate of bug 428365 ***