The thread that brought this up describes the problem on Android, which is pretty novel. On desktop the restart resolves it.
Bug 1773504 Comment 9 Edit History
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The thread that brought this up describes the problem on Android, which is pretty novel. On desktop the restart resolves it. It is entirely possible that what we're seeing here is "consumer hardware and XML parsing standards are fundamentally antithetical" and that extremely rare transient errors that would be survivable and likely unnoticeable in any other data stream cause XML parsers to do exactly what they're designed to do, exactly what the spec says they should do: fail immediately and catastrophically on any error. I'm proposing, effectively, that we play the odds here and throw those dice again, just once.