Profile: https://share.firefox.dev/3lGjOad The APZScroll markers in this profile have end times that are likely wrong. Specifically, the second, third, fourth and fifth marker seem to end one frame to early. The markers make it look like the first and second APZScroll payload were presented by the same composite, and then there was a composite between the fifth and sixth payload that did not present any payload. But in the screenshots you can see that the composite in question did indeed have a changed scroll position.
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Profile: https://share.firefox.dev/3lGjOad The APZScroll markers in this profile have end times that are likely wrong. Specifically, the second, third, fourth and fifth marker seem to end one frame too early. The markers make it look like the first and second APZScroll payload were presented by the same composite, and then there was a composite between the fifth and sixth payload that did not present any payload. But in the screenshots you can see that the composite in question did indeed have a changed scroll position.