fix: Bloc instance was null on initial state#3921
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Description
Fixes: #3918
In Flame,
isMountedbecomes true afteronMount()finishes. ButFlameBlocListenablecallsonInitialState()insideonMount(), so when the user accesses this.bloc there, the getter checks isMounted — which is still false, triggering the assertion. The bloc is already resolved, just not considered "mounted" yet.Checklist
docsand added dartdoc comments with///.examplesordocs.Breaking Change?
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