Gazzagreen If WW fails to set the charge preset, the previous one in the same slot is still enabled. WW doesn't disable the charge schedule after the charge window has finished, it only resets the charge rate back.
So there should be no need to disable that same slot as Wonder Watt will overwrite it at the next run, and if for some reason the API call fails (rare, but does happen), the previous settings should still be actioned.