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Read subject. Fed up with this incomplete rulebook. I'm in the middle of a game and I haven't played much since 7th Ed and 9th edition just pisses me off.

Where in this section do these people specify this

You want to check the FAQs.

https://www.warhammer-community.com/faqs/

SETTING UP UNITS DISEMBARKING FROM A
DESTROYED TRANSPORT
When a Transport model is destroyed, if you cannot set up every
model from a unit that was embarked within it, only models that
cannot be set up are destroyed.

I don't know exactly where to find it but there is a 9th ed core rulebook update from indomitus that states

"When a TRANSPORT model is destroyed, if you cannot set up every model from a unit that was embarked within it, only models that cannot be set up are destroyed."