When I fall high enough to take fall-damage, you get knockbacked a little bit.
And it seemed like it affects "damage" too, for example when zombies get damage from the sun, they get knockbacked too.
Related issues
duplicates
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migrated
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-95539. You can find or add further information on that report.
If you haven't, please search before reporting any bugs, as it's likely that one exists already.