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Not a bug. When you apply renames to the join tool it is only for the Join. The Right and Left will not have the rename applied. Will need either select after union or multiple selects for Left/Right before Union.
I don't think SELECT after UNION would work, you'd end up with duplicate names if you wanted to make all streams have the same renames as configured in the JOIN tool. It would have to be before the UNION.
Why would this be the intended behavior?
If you specify renames in the Join tool, wouldn't you want it to apply to all parts of that tool, especially since it doesn't have separate configurations per output? If a tool doesn't have separate configurations for each output, isn't it more natural to assume its configuration applies to the whole tool?
If you want separate renames per output, isn't it more natural to handle the renames separately using Select's?
My suggestion would be to use Dynamic Rename tools after the Join Tool's L and R outputs and then use the Union tool to bring them all together. Then you don't have to worry about selecting all the fields.