Ok, I have dug into this. Obsidian introduced a non standard YAML parsing by splitting text at the comma for ease of input.
Obsidian Interprets aliases: a, b and aliases: "a, b" the same way as TWO aliases a and b.
In standard YAML, aliases: a, b and aliases: "a, b" should be interpreted the same was as ONE alias a, b.
The same thing happens with tags.
If you want to adhere more strictly to YAML, I suggest you use the square bracket notation ["a, b"].
If you don’t like this deviation from the standard, open a FR.
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