EditCondition appears to edit the property. This is defined in MovieSceneSequencePlayer.h:

/** Start playback at the specified time */
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="Playback", meta=(Units=s, EditCondition="!bRandomStartTime"))
float StartTime;

When you break out the settings in blueprints, bRandomStartTime appears to be false but is actually true.

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Won't Fix
ComponentUE - Gameplay - Blueprint
Affects Versions4.19.24.20
Release Commit4153062
CreatedJul 21, 2017
ResolvedAug 18, 2021
UpdatedAug 18, 2021
View Jira Issue