Eye of Ender in the mainhand doesn't block offhand item usage

When one has an eye of ender in their main hand and a placeable block in their off hand, right-clicking will throw the eye of ender and place the block at the same time.

Also happens when you have an ender pearl in the offhand, it is then thrown together with the eye of ender.

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Code analysis by Marcono1234 in this comment