Ws2811 strip from govee with arduino - LEDs and Multiplexing

Hello folks! I bought a ws2811 (segmented control, 5 leds on 1 ws2811 chip) led strip from govee and have successfully controlled it several times with my Arduino and the Fastled library. For a larger project I have now bought the 20m set from Govee, consisting of 2x10 meter led strips (24v). I was able to control one of the two strips as usual with my arduino, but not the other. I can rule out hardware errors. Does anyone have any idea what could have happened? Both strips work with the suppli

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