Inconsistency when coloring cell with "apply last cell color" and "open cell colors"

[ME7DYCgw8M]

Reproducing:

TLDR: "apply last cell color" colors also subcells

Case 1

1. Make cell (cell 1)
2. Make subcell (cell 2)
3. Color cell 2 with ALT+SHIFT+F9 (open cell colors) red
4. Color cell 3 (any other cell but not cell 1 or cell 2) with ALT+SHIFT+F9 (open cell colors) green
5. Color cell 1 with ALT+SHIFT+C (apply last cell color)
6. Cell 2 is also colored with cell 3 color green

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TLDR: "open cell colors" does not color subcells

Case 2

1. Make cell (cell 1)
2. Make subcell (cell 2)
3. Color cell 2 with ALT+SHIFT+F9 (open cell colors) with red
4. Color cell 1 with ALT+SHIFT+F9 (open cell colors) with green
5. Cell 2 stays red

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In case 1 subcell is colored with parent cell color. In case 2 subcell color is unaffected by cell 1 color change.

If this intentional, so be it.
But I think both cases should leave subcell coloring red.

Ps. Treesheets is awesome!