Since there was no Clash button in the client after a day, and no "!" announcement, no client announcement, and the announcement with the test was gone from the client, I searched on website for it and found it. so for people that did not dig so deep original announcement with update

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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