My understanding is that handbrake using foreign audio search will fail if the subtitle is in a separate track, and NOT marked as forced.
I think this is right. HB looks for a subtitle track that is significantly smaller than the others. Maybe I have an older nightly build than you and mic j, which is why it failed to pick up the correct track for The Avengers, but mic j is also correct that it's worth having a fallback if it fails.
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