Mi 8 – TWRP error 255 – PC connection – Xiaomi

Good morning,
I updated my Mi 8 from Q to R and finally S version 1.9.
1- When I backup with TWRP -3.7.0_9-0-dipper it fails with “create tarfork() eror 255”, while if I deselect the data folder the backup goes to
successful. Backup to an OTG stick with plenty of free space.
2- With the Windows LTSC 2021 x64 PC I can do all the operations with ADB, but the phone is no longer detected by file explorer and MyPhoneExplorer.
I haven’t changed any apps or settings on my phone since the Q-R-S- step, keep in mind that I use Shelter with Whatsapp installed.
I hope I have explained the problems well.
What am I doing wrong?

Thanks for your help

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