In theory, yes. In practice, there are throngs of parsers and converters who might handle such cases differently. https://seriot.ch/projects/parsing_json.html

I mean hopefully not, but the linked example is about JSON parsing, not UTF-8.

	▲	gritzko 2 days ago \| parent [-]
		A big chunk of bugs there are Unicode related, that is my point. When people parse JSON they don't think that they also parse Unicode.