Every time I pressed W or S I would spam a bunch or random numeric values on chat window, the format of the message was also strange, It would be something like: 0<All> 0.2189271281728972182191 <--- or any given value there and it wouldn't show my name on the text like if I was the one writing it.
I don't think it was any kind of debugging data that I am supposed to see and I believe it is related to mech speed. I didn't do anything unusual and it happened from the beginning of the match as soon as I accelerated, no other keys triggered that issue.
I'm not sure if other players were able to receive the spam or not, I'll try to replicate it and I'll give you guys an update on the subject if I'm successful.