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Never had this problem.

Never used Klipper or a genuine BLtouch 3.1 either.

Only the SD card uses 3.3V; the board uses a 4050D level shifter to step the voltage down on that. The Atmega chip on the Anet board runs off 5V so it would be ok.

I'd guess it was the servo wiring but it works normally after boot so I don't know. If (when!) you figure it out, send word of your victory.