New Classification Workflow crashes QGIS on Ubuntu 20.04

The workflow is opened and visible for a short time (1-2 s), then QGIS crashes

Only message in bash:

QGIS died on signal 11139

This was only tested inside qgis/qgis:release-3_18 docker image with xserver. Has to be evaluated whether this is an issue on “real” OS installation

3.18.3-Zürich
Running against Qt 5.12.8
Running against GDAL/OGR 3.0.4
Python '3.8.5 (default, Jan 27 2021, 15:41:15) \n[GCC 9.3.0]'
Ubuntu 20.04.2 LTS

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