Hi Kovoschiz and thank you a lot for your feedback.
So you say that the order and content of the semicolon-seperated lists in architect=* and architect:wikidata=* should match? That means that the first wikidata-entry describes the first architect? I didn't consider this and interpreted the additional ";" as a typo.
Is there anything on the wiki about this system?
I did several edits where I removed a ";" from a wikidata-tag. I will revert them.