Cannot Add Block Above Table When Table is First Block

Describe the bug
When a Table block is positioned as the first block in the document, there is no way to add a block above it.
Current behavior:

Can position cursor above the table using keyboard arrow keys
Pressing Enter while cursor is above the table does NOT create a new block
The plus button on the left side of the table only adds blocks below the table
No UI or keyboard method exists to add content above a table when it's the first block

Expected behavior:
When the cursor is positioned above the table (first block), pressing Enter should create a new paragraph block above the table.

To Reproduce
Create a new document
Insert a Table block as the first block
Use keyboard arrow keys (↑) to position cursor above the table
Press Enter key
Observe: No new block is created above the table
Try using the plus button (+) on the left side
Observe: Can only add blocks below the table, not above

Video demonstration:
https://github.com/user-attachments/assets/ed91bd29-44cc-4849-b583-d40282fa3b02

Online reproduction:
You can reproduce this on: https://stackblitz.com/github/TypeCellOS/BlockNote/tree/main/examples/01-basic/01-minimal

Add a table as the first block
Follow steps above

Misc

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Start with the reproduction in examples/01-basic/01-minimal and add a table as the first block. Trace the handling of the cursor-above-table state and Enter key, then verify that Enter creates a paragraph above the table and that the behavior works in the linked online example.