issues with hit detection/registration in PvP since server switch to 1.21

Hi I found out that the hit registration doesnt work amazing since I updated my server to 1.21 or higher. Players will sometimes when hitting a player the player just slows down from the hit but doesnt actualy register that hit doing no damage/sending a damage event. I found that having a higher ping makes this even easier to happen, making pvp unplayable for a bit higher ping players. This issue is also happening to bigger servers like mcc island that recently updated to 1.21

You guys prob have already gotten a bug report like this, but I just wanted to make sure that you guys know of this bug, thats why this report. Thx for reviewing