Arduino IDE: Yellow background and no text on Raspberry Pi 3b

I am running Manjaro 20.07 XFCE (64 bit) on my Raspberry Pi 3b.

When I start the Arduino IDE 1.8.13 it only shows a yellow background but no text, no buttons, nothing (see attached image). When I move the mouse to the top left of the window and press the left button a gray menu pops open but again there is no text.

To have a look if this is a problem of the precompiled package that comes with Manjaro ARM I compiled the source code of the IDE myself and started it. But it looks identical: Yellow background and no text.

Can anybody help solving this issue? Thanks!

BTW: I have jre-openjdk 14.0.1 installed

Screenshot_2020-07-21_11-37-11.png