I generated a new world in MC 16w39c and I grabbed a sword. It didn't have an attack cooldown. I tested it on other tools and they also had no attack cooldown. When I saved and quit and opened the world back again, the cooldowns did work. I don't know why and how it happened, but there must be some bug causing this since I didn't do anything else in that world yet.
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Is this still an issue in the most recent versions (currently that is 1.11) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time. If you are the owner/reporter of this ticket, you can modify the affected version(s) yourself.
Confirmed for 1.14.4. Seems to activate under oddly specific circumstances which I cannot yet determine, however I have only been able to get it to affect items with a modified attack cooldown attribute.
The attack cooldown bar appears but never fills up. The game treats any use of the weapon like spamclicking, only dealing 1 damage per hit. When the bug activates it will affect all items with a modified attack cooldown.
Tested on a vanilla multiplayer server. Relogging or dying seems to temporarily fix the issue.
This isn't the same issue as the one you're describing. The issue I had was that tools were acting as fully charged every time without a cooldown. Please make a new bug page
Please force a crash by pressing F3 + C for 10 seconds while having the issue and attach the crash report (minecraft/crash-reports/crash-<DATE>-client.txt) to this ticket.