I just noticed this problem for the third time now so I think I’ll post it.
Every so often I boot the system normally and the taskbar is nowhere to be found, this is in kde.
The only thing I can do is create a default panel so that I can at least get access to stuff but this is happened three times in the last 2 weeks it’s very weird to completely lose that taskbar.
Well without any information one can just guess. It’s definitely not a a common kde plasma behavior so you must have changed a theme or installed a package that conflicts with kde. Who knows. It’s up to you to provide relevant information, rather than snappy answers.