In

we set a number of search fields to utf8mb4. However, we also search in vernacular_by_name.name, vernacular_by_ott.name, ordered_nodes.name and ordered_leaves.name. Although these should only contain scientific ("latin") names, and so should not need full 4-byte unicode, it might be as well to add those columns to the list to MakeFullUnicode() too.

I assume that using utf8mb4 won't make searching these fields noticeably slower, but perhaps it's worth testing?