fix asset loader preregistration for multiple assets #9453
Merged
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Objective
fix #9452
when multiple assets are queued to a preregistered loader, only one gets unblocked when the real loader is registered.
Solution
i thought async_channel receivers worked like broadcast channels, but in fact the notification is only received by a single receiver, so only a single waiting asset is unblocked. close the sender instead so that all blocked receivers are unblocked.