I should probably mention why I'm pointing to bug 1848518 in particular. While I was using mozgression with GeckoViewExample, it turned out that bad builds had audio playback (together with the problem described here), whereas "good" builds had no audio playback (but didn't have the problem described here). That helped me reach the last known good build quicker ("do I have audio playback in GVE?"), then I confirmed in Firefox Nightly that this was indeed the last known good build for the problem described here.
Bug 1853012 Comment 7 Edit History
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I should probably mention why I'm pointing to bug 1848518 in particular. While I was using mozgression with GeckoViewExample, it turned out that bad builds had audio playback (together with the problem described here), whereas "good" builds of GVE had no audio playback (but didn't have the problem described here). That helped me reach the last known good build quicker ("do I have audio playback in GVE?"), then I confirmed in Firefox Nightly that this was indeed the last known good build for the problem described here.
I should probably mention why I'm pointing to bug 1848518 in particular. While I was using mozgression with GeckoViewExample, it turned out that "bad" builds of GVE had audio playback (together with the problem described here), whereas "good" builds of GVE had no audio playback (but didn't have the problem described here). That helped me reach the last known good build quicker ("do I have audio playback in GVE?"), then I confirmed in Firefox Nightly that this was indeed the last known good build for the problem described here.