Why can't i use pings anymore?

I was in a game today and realised I couldn't ping on may way or danger and so on. Couldn't ping items or anything else either. I went to my settings, but it said the keybindings was there. How do I fix this? Wtf is wrong?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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