Given that failures happens on tests specifying reftest-async-scroll and those failures are not perma, it's high frequent intermittent, it looks like with SW-WR we take a snapshot before applying the async scroll offset even though it's [a sync IPC call](https://searchfox.org/mozilla-central/rev/72951aa826642f048da4c6b71b8b3e36a9606dcd/gfx/layers/ipc/PWebRenderBridge.ipdl#97), the call ends up [deferring the task to the updater thread](https://searchfox.org/mozilla-central/rev/72951aa826642f048da4c6b71b8b3e36a9606dcd/gfx/layers/apz/src/APZUpdater.cpp#279-289), that's the problem?
Bug 1704000 Comment 10 Edit History
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Given that failures happen on tests specifying reftest-async-scroll and those failures are not perma, it's high frequent intermittent, it looks like with SW-WR we take a snapshot before applying the async scroll offset even though it's [a sync IPC call](https://searchfox.org/mozilla-central/rev/72951aa826642f048da4c6b71b8b3e36a9606dcd/gfx/layers/ipc/PWebRenderBridge.ipdl#97), the call ends up [deferring the task to the updater thread](https://searchfox.org/mozilla-central/rev/72951aa826642f048da4c6b71b8b3e36a9606dcd/gfx/layers/apz/src/APZUpdater.cpp#279-289), that's the problem?