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Fortunately, the PNG problem is fixed in the Raspberry Pi implementation of version 13.0. Now exporting to PNG works, which means the WLFJ-paclet also works!
The 32 bit armhf version of Mathematica works fine on RPI OS 64 bit bullseye: sudo apt update sudo apt full-upgrade sudo apt install wolfram-engine This installs the 12.3.1 version of Mathematica.