Prevented Loss?

Today I lost a ranked game and as normaly I thought that I will lose Lp. But when the game finished I got +0 Lp because it was printed loss. All I want to know is what is prevented loss and how do u get prevented loss?

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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