The reftest snapshot shows the red rectangle, which is the same thing we were seeing in bug 1768650. Per discussion in bug 1768650 comment 6 - 7: this test might be triggering an invalidation race condition of some sort, and has been intermittent with webrender over the years. The test is currently annotated to run with `pref(gfx.webrender.svg-images,false)` which seemed to fix the intermittent (bug 1768650) but apparently doesn't *entirely* avoid it, per this bug here. Given that we've got 8 months since bug 1768650 was closed with no reports, and now we have 17 reports on a single day, I think it's safe to say that something has regressed here (or some change has tickled things such that the race condition can once again be triggered)...
Bug 1817212 Comment 1 Edit History
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The reftest snapshot shows the red rectangle in its initial position, which is the same thing we were seeing in bug 1768650. Per discussion in bug 1768650 comment 6 - 7: this test might be triggering an invalidation race condition of some sort, and has been intermittent with webrender over the years. The test is currently annotated to run with `pref(gfx.webrender.svg-images,false)` which seemed to fix the intermittent (bug 1768650) but apparently doesn't *entirely* avoid it, per this bug here. Given that we've got 8 months since bug 1768650 was closed with no reports, and now we have 17 reports on a single day, I think it's safe to say that something has regressed here (or some change has tickled things such that the race condition can once again be triggered)...