Dear Wolfram Community,

for some time now I observe the following issue under Wolfram installed within a docker container on a Raspberry Pi. When I try to export something to png, e.g.,

Export["test.png", Plot[x, {x, 0, 1}]]

I get

Import::fmterr: Cannot import data as PNG format.

On the other hand I can export to, e.g., jpg just fine. Moreover, I can import png images without problems.

Some information on my environment:

The Wolfram engine is installed in a Docker container running on a Raspberry Pi 4 with Ubuntu 20.04.
I tried different base images which both showed the same above described behavior:

• the official python:3.10-bullseye container, where I added the deb http://archive.raspberrypi.org/debian bullseye main and added the armhf architecture to dpkg before installing the wolfram-engine package. (This setup did already work in the past, but at some point a rebuild of the image must have broken things, which I didn't realize as I did not export to png for some time.)
• the image navikey/raspbian-bullseye where I just added the armhf architecture to dpkg and then installed the wolfram-engine package.

Can somebody else reproduce this problem or has a hint on what I'm doing wrong.

Thanks and Best Regards,
Dominik