Hi, i have the same strange behaiviour here.
When creating a new Customer Order (Commande) the data in the “xxx_commande” Table public_note is saved encoded, ä => ä
which will generate errors creating the odt file.
when editing the field (note_private or note_public) the encoding in the database is correct, so the umlauts are saved as äöü.
Does anybody have the same error?