Could you retest on 128.0b6? I'm thinking this could be bug 1903027, which was uplifted to b6. I'd guess ARM is irrelevant, and it's more dependent on the actual input and output devices used.
Bug 1903782 Comment 2 Edit History
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Could you retest on 128.0b6? I'm thinking this could be bug 1903027, which was uplifted to b6. I'd guess ARM is irrelevant, and it's more dependent on the actual input and output devices used. macOS 12 is relevant, since we have disabled platform voice processing there.