I have the same similar experience with Yes 5G home .... i was attracted to their package and applied for it.

Soon i learned that certain websites and especially Google chromecast cannot stream Netflix, HBO and Hotstar properly.

But my home fibre maxis was okay, soon i tried U mobile home 5G and everything is okay, so i cancelled YEs 5G home.

Althought Yes 5G home has very good speed test result (better than U 5G) but it is a pain to use for me ....

There was someone posted the reason in another thread about how Yes 5G route their backend differently although using the same 5G network.