RPi4 latest alpha (9.1.002): Netflix plugin can't find inputstream.adaptive Henk31 Sep 8th 2019 I see the same error in my logs but Netflix plays fine here. Are you using the HDMI port next to the power jack?
LibreELEC (Leia) 9.2 ALPHA1 with Raspberry Pi 4B Support Henk31 Aug 10th 2019 9.1.002 is RPi4 not RPi3