Normal Ghasts Should Ignore Players Riding on Happy Ghasts

The idea here is that it wouldn't make sense for Ghasts to attack one of their own, even if they look different from a normal Ghast. Excluding the harness, Happy Ghasts look nearly identical to normal Ghasts.

Because Ghasts move more slowly than Striders and are so much bigger, I don't think it'd completely invalidate them in terms of Nether traversal. Ghasts also infamously have low HP, and it seems like the Friendly Ghast is no different. Striders being bulkier means it's easier for them to navigate and can tank more hits from hostile mobs. Ends up being a trade-off IMO.