[MC-73532] Minecart with uuid summoned atop detector rail via fill clock cannot be /kill'd

Sorry, not a bug, please close this.

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This bug is crazy. It's existed since at least 1.8.

I'm attaching a world with just 4 command blocks that completely demos the bug. The world is totally self-explanatory (has signs).

The weird thing is that the bug goes away if any of the following is true