Hi,
you must change your python lib path from /etc/openhab/automation/lib/python to /etc/openhab/automation/jython/lib
the old legacy configuration was
python libs: $OPENHAB_CONF/automation/lib/python
python rules: $OPENHAB_CONF/automation/jsr223
the new unified configuration is
python libs: $OPENHAB_CONF/automation/jython/lib
python rules: $OPENHAB_CONF/automation/jython
it is already documented here
but should be mentioned in breaking changes too, before the final release.