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Masterpiece
The japanese maple I own show this kind of behaviour: during fall/winter the leaves start to dry and fall without fall color, like the leaves from the back of the picture are now.
Exactly.
When they go dormant here, I am now carefully cutting the dead and dry leaves, leaving the petioles.
I try not to touch any visible buds, and it's been working well. So when they wake up they just sprout new leaves.