Right now (I think) APZ returns eConsumeNoDefault on touch events inside the slop region, so we probably don't send pointermove events for those touch events either. However the use cases are different - the first touchmove is important because it can be cancelled, but the pointermove has no such significance. So we should fire pointermove events even for touch inside the slop. Chrome and Edge are also going to be doing that if they don't already.
Chromium bug https://crbug.com/632067
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