Oh, my apologies, I can reproduce on Nightly too. I had previously had software webrender enabled on my nightly installation when I tested. In that case this seems unrelated to bug 1728064. I will investigate further.
Bug 1730458 Comment 4 Edit History
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Oh, my apologies, I can reproduce on Nightly too. I had previously had software webrender enabled on my nightly installation when I tested. In that case this seems unrelated to bug 1728064 and 1630356. I will investigate further.