I just recently started playing 2v2s and turns out that it hasn’t really stopped.
I realised that the reason I thought it stopped was because opening the chat is not what causes this glitch, sending a message is what does. Doing this allows you to reproduce it consistently.
Again, this is specific only to a phone and doesn’t apply to a computer.
It hasn’t affected my gameplay too much as it stops when you reload the page, but it is still a slight inconvenience.