Basically the damage tilt indicator is tilting the screen depending from the area an entity hits you. But after 1.3.1 release as I remember it stopped working and the screen is tilting only sideways. Idk if y'all guys just forgot abt it or decided to leave it like that but let me know why you didn't fix it because I'm very curious, thank youu.
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-26678, which has been marked as Won't Fix - while this behaviour is not desirable, the developers have said that they will not or cannot fix it.
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