Back in the version 1.2 a feature was added which made the screen shake in the direction you were hit in. Suddently in the version 1.3 the thing stopped working and the screen shaked only to the left/right this bug wasn't fixed in all those years
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migrated
migrated
heres a video of some peeople who fixed it with a mod and there they talk a little more about what went wrong the video: https://www.youtube.com/watch?v=pAJPc71YOnY&t=314s
Duplicate of MC-26678, which has been marked as won’t fix.