Yes, it seems that Logseq doesn’t consistently render the YAML front matter. I find many documents where the front matter is clean and tags are links.
Yes add one element, and it goes to pot.
It’s because the rewrite Logseq does place a tick in front of the --- notation on the first line. It also adds a space in front of the old YAML, plus a tick in front of the new element.
For interoperability, the option to not reformat or to recognize elements in documents, like YAML front matter, would save lots of time. Even things I’m editing in other tools are getting reformatted.