Obscured shadow blocks wrongly shown

[SimonShiki]

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Description

Open a project from legacy scratch-blocks that have potential obscured shadow blocks, then the shadow block wrongly get shown.

Steps to Reproduce

1. Create a project with these blocks in editor that uses legacy scratch-blocks:

2. Save then load in our editor, observed:

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Environment

• Device:
• OS:
• Browser:
• Version: latest commit on dev/3.2

Additional Info

I think we should implement a sb3 roundtrip