Setup:
You have boots that use the movementSpeed attribute
You are wearing and holding the boots
Place in a command block and activate it to obtain test boots:
give @p minecraft:leather_boots 2 0 {AttributeModifiers:[{AttributeName:"generic.movementSpeed",Name:"generic.movementSpeed",Amount:0.5,Operation:0,UUIDLeast:894654,UUIDMost:2872}]}
When you switch to another slots that does not have the boots, The speed attribute is removed even though you are still wearing the boots. Only way to correct the issue is to then take the boots off and put them back on to apply the speed attribute again.
Comments 3
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. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.
Possibly relates to: MC-67885 and [MC-64311]