Thanks again, Rich, that worked for me. A few additions for future readers of this post:
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The first option doesn’t work since changing the version to be installed in openHABian.conf has no effect whatsoever. It will always install OH5.
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The openHABian image defaults to timezone Europe/London. If you are not situated in that timezone and change it via openhabian-config, the system timezone wil be changed but not the -Duser.timezone in EXTRA_JAVA_OPTS in /etc/default/openhab, which in my case made my fixed-time rules trigger one hour late. Searching the forum tells me that has been the case for a long time? ( [SOLVED] Log time vs System Time - Mismatch (No Timezone Adjustment) - #4 by BigRedBrent ).