Randomly you will be unable to PvP, no matter what you do you cannot hit anything; player or mob. Also when this happens your entire inventory gets locked, you cannot move anything, drop anything or throw any potions. Also to other people it appears that your sprint hacking because sprint particles show up under your feet even when your not moving. This happens to everyone on every server that I log on to, not just one server or one person.
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is duplicated by 3
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Nope, I will be running Minecraft at 100+ fps and nothing works. Even in bad lag you can organize your inventory, you can move your stuff from your inventory into your chests. You cannot do any of this. Also, this happens on all the servers I've tried.

Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.
Minecraft crash report when the bug/glitch is happeneing
This ticket is invalid as it relates to a modded or 3rd party client/server.
Any non-standard client/server build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the plugin creator.
This site is for addressing issues related to the base unmodded MineCraft.
I forced update, my client is now vanilla and it still happens (uploaded new Crash file)
Ok reopened.
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
No answer on querry, assuming not an issue anymore.
I think the hitboxes is small
Sounds like ordinary lag to me...