You'll notice
Useful2 Signal2
Invoking the prototype skill yourself now actually starts prototype mode.
What's wrong with this entry?
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What
Calling the prototype skill yourself now marks prototype mode as started, as invoking it any other way already did. This does not happen when the skill is only being preloaded or when the model scheduled the invocation itself.
Evidence
prototype_started
Strings lifted out of the shipped bundle, so the claim above can be checked against them.