As for now, File Roller 3.2.1 puts its temp files not in folders like '~/.fr-a1b2c3', but in '~/.cache/.fr-a1b2c3', so I've reported that as bug #883628.
As for now, File Roller 3.2.1 puts its temp files not in folders like '~/.fr-a1b2c3', but in '~/.cache/ .fr-a1b2c3' , so I've reported that as bug #883628.