Why did all my box collision shapes shrink when updating to Godot 4

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:bust_in_silhouette: Asked By TownEater

I have been attempting to update my project from Godot 3 to Godot 4. Among the other issues I have been fixing, I have found that all of my collision shapes in all my scenes have been shrunk. The Transform of the colliders was NEVER changed from defaults, so the issue is not with the scale. Comparing the .tscn files before and after updating reveals no change to the extents of the shape. For example:
extents = Vector3( 0.537292, 1, 0.417988 )
Became:
size = Vector3( 0.537292, 1, 0.417988 )

However, the editor tells another story:
The collider in the editor for Godot 3
Became:
The collider in the editor for Godot 4

I am not sure why the same collider with the same extents would take up less space when migrated to Godot 4. This happened with ALL my colliders. Is there any reason for this? Can it be fixed without re-doing all of my collision shapes?