I think the behavior is because XDP (in my case) still believes it is a blend. The convert to editable shapes isn't removing XDP's blend behavior for recoloring the start/end parts of the blend.
Strikes me this was discussed/mentioned in the not to distant past.
It's nothing to do with blends. Just create numerous rectangles of different colours, Drag select them and try changing their colour using the eyedropper Only 2 change colours & only one adopts the eyedropper selection colour, the second one to change only takes on a shade of that colour.
By the way, if you select the small purple square and copy it, then drag select the rectangles and Ctrl+Shift+A they all change colour as expected.
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