I think something has been different via Disney+ for Hulu content and SF just never adjusted.
The Hulu content will always be on hulu.com as well and so far hulu is working via SF.
So might not be a priority for SF to fix via Disney+.
I still am too lazy to check but I could never get Hulu content via Dusney+ selecting 4k.
With hulu content 4k via disney always errored for me, yet no issues via Hulu direct.
So went to hulu and 4k worked. Maybe SF fixed or not but if not that proves Hulu content is an issue via Disney+.
Contrary to what others say abut the Hulu app, hulu.com is not going anywhere as they still sell just plan Hulu subs.
If app goes I have no idea how you get Hulu, I suspect it’s via Disney+ app, which too me just seems weird.
So best to get Disney+ with Hulu, last checked to get both it was $1 more.
Then wait a month or so at full price, cancel, and get a half off monthly price offer.