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So after some closer review, the iPad invokes iCloud Private Relay for DNS queries and other items.
From the iCloud Private relay article:
Private Relay can be turned on or off just for a specific network using the Limit IP Address Tracking preference.*
On your iPhone, iPad, or iPod touch, go to Settings > Wi-Fi, then tap the More Info button next to the Wi-Fi network. Or for cellular networks, go to Settings > Cellular > Cellular Data Options.
On your Mac, choose Apple menu > System Preferences, then click Network and select the network from the list to see more options._
This is likely the cause of our unexplained QUIC traffic: system DNS works as expected, and mask.icloud.com resolves here. Then iOS invokes iCloud Private relay for user DNS lookups for things like Safari. Our firewall drops this traffic, and these delays in DNS lookup are probably just along enough to cause issues. and this failure can take just along enough to cause our video to fail.
With this understood, Apple does list some recommendations for network admins to clearly disable iCloud Private relay. The average user though may find themselves with an apple device not working on someone else's network where this is blocked. Are there improvements that can be baked into the Private Relay protocol?