Incorrect blockGap value when using the useBlockSpacing hook

[asvinb]

Describe the bug

I have a block with a manually set block gap value. However, when using the useBlockSpacing hook to retrieve the block gap, it always returns the value defined in theme.json, ignoring the value explicitly set in the block's attributes.

Steps to Reproduce

1. Add a block which supports the blockGap property.
2. Set a specific block gap value
3. Check the returned values from useBlockSpacing hook, where the blockGap value does not match.

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