Ender 3 V2 Power from pi

What is the problem?

Ender 3 V2 powered from the Pi

is this normal?

I don't know if I use the term "normal" but it is typical of Creality printers. See https://community.octoprint.org/t/printers-known-to-have-backpowering-issues/25913/27.

You should isolate the RPi from the printer by either modifying your USB cable or using an adapter. See https://community.octoprint.org/t/put-tape-on-the-5v-pin-why-and-how/13574.

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