That's no bug. Stock ROM is encrypted by default, which leads to the weird folders. To decrypt you need to go to the wipe section in TWRP and choose "Format data". You will lose all your data. After that you can install Magisk and setup your device.
Sent from my STF-L09 using XDA Labs
Ok I did it... now the strange folders are away... but have bootloop now... (Boots to Huawei Logo than smartphone restarts... after some fails it boots to Huawei eRecovery).....
Tried to do factory reset in TWRP... still looping.... what went wrong, an you help me please :3
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EDIT: FIXED BY ALSO WIPE INTERNAL STORAGE
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