LEDs light up when switched on

I have flashed a D1mini microcontroller with the version WLED_0.12.0_ESP8266.bin and set the config so that the LED strips remain switched off when voltage is applied. This also works with this version. But when I flash the WLED_0.13.0-b5_ESP8266.bin or WLED_0.13.0-b6_ESP8266.bin, a couple of LEDs light up when the power is on. I have a 5 meter BS2812 strip with 300 LEDs on it. I have already tested it with a Wemos D1mini pro and it is the same phenomenon. Does anyone know the problem or is there a setting in the web interface that could interfere?

Are you saying that WLED “power” is off, and when electrical power is switched on to the D1 Mini, WLED still appears to command a couple LEDs on?

You might consider a power-on preset that turns on WLED, sets the color to black, brightness to 0, and then runs another preset which turns WLED power off (as viewed from WLED app or web site).

Thank you huggy for your reply. I will test that idea in the next days.