I had a similar issue and had to set UTF 8 as described here OH3: „Umlaute“ change to „?“ after restart - #8 by sheldon … not sure which system you are running on so this might not be aplicable.
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I had a similar issue and had to set UTF 8 as described here OH3: „Umlaute“ change to „?“ after restart - #8 by sheldon … not sure which system you are running on so this might not be aplicable.