There’s not a rule, it’s just a “sounds correct”. Because English doesn’t have rules, it has exceptions.

Cambridge even uses the word “normally” lol. https://dictionary.cambridge.org/grammar/british-grammar/adjectives-order

And here’s a fun stackexchange link where people argue about the order (since there isn’t a rule, it’s all made up). https://english.stackexchange.com/questions/1155/what-is-the-rule-for-adjective-order

One good quote from that link:

@cori - the fascinating linguistic point is that native speakers will have subconsciously inferred a rule like this without it ever being stated. The “rule” is really an observation of what they do. All languages and dialects consist of such unconscious rules. – Nathan Long Commented Apr 16, 2013 at 15:25