Videos in Messages chats look terrible on iPhone 11 Pro

I seem to be having an issue with my iPhone 11 Pro. Videos sent from my Mac to iMessage chats look like garbage (tiny, really low-rezzed down, pixellated when viewed) on my phone. Videos sent from my phone look like garbage on my Mac in the same chat thread. Videos sent from other people’s phones look like garbage on my phone, but fine on the Mac in the same chat, and fine on other people’s phones (no iPhone 11s though) in the same chat. It’s definitely not a storage issue - I have several hundred GB free. The low-res image setting in Messages is off. Update: I have isolated this to only happening in group chats. Regular 1:1 message threads seem to have fine videos. Has anyone else seen this?