QA:QA Backwards Compat

Build 1301 on make-button-non-polymorphic
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Baseline History
Build 130134b47dc
Current build. There are unaccepted changes, so build 1286 is still the baseline.
Build 1285f9cd04c
Accepted by Joana Moreira.
Build 1258d84d83b
Accepted by Josh Wooding.
Build 1245a8ee57c
Accepted by Liberty Curtis.
Commenting is disabled because there's a newer build on this branch