Bug: An error occurs when navigating a table with merged cells using the arrow keys(keyboard).

[kmslab20]

Lexical version: 0.17.0
OS: Windows 11
Browser: Chrome latest (127.0.6533.100)

Steps To Reproduce

1. Visit playground
2. Remove all contents, and insert a table (I picked 5x5, any size is OK)
3. Merge some cells.
4. Navigate the cells using the down arrow key, from right side or inside the merged cell.

2024-08-13.11-07-18.mp4

2024-08-13.11-08-49.mp4

2024-08-13.17-00-50.mp4

The current behavior

When I navigate the table with merged cells, this error occurs in some cases:

Uncaught Error: Node at cords not TableCellNode.
    at rs.getCellNodeFromCordsOrThrow (main-CUjk_Nh6.js:59:32769)
    at sS (main-CUjk_Nh6.js:59:25177)
    at xc (main-CUjk_Nh6.js:59:28983)
    at Array.<anonymous> (main-CUjk_Nh6.js:59:17723)
    at Yx (main-CUjk_Nh6.js:51:24287)
    at main-CUjk_Nh6.js:51:24077
    at Jx (main-CUjk_Nh6.js:51:25451)
    at Gn (main-CUjk_Nh6.js:51:26422)
    at yg.update (main-CUjk_Nh6.js:51:43947)
    at Yx (main-CUjk_Nh6.js:51:24063)

I tried this in my React app, and the error message was like this:

Uncaught Error: Node at cords not TableCellNode.
    at TableNode.getCellNodeFromCordsOrThrow (LexicalTable.dev.mjs:2710:13)
    at selectTableNodeInDirection (LexicalTable.dev.mjs:2189:39)
    at $handleArrowKey (LexicalTable.dev.mjs:2420:16)
    at Array.<anonymous> (LexicalTable.dev.mjs:1669:95)
    at triggerCommandListeners (Lexical.dev.mjs:8113:27)
    at Lexical.dev.mjs:8097:19
    at $beginUpdate (Lexical.dev.mjs:8230:5)
    at updateEditor (Lexical.dev.mjs:8306:5)
    at LexicalEditor.update (Lexical.dev.mjs:9961:5)
    at triggerCommandListeners (Lexical.dev.mjs:8096:12)

After the error occurs, the lexical editor no longer works properly.

The expected behavior

When the down arrow key is pressed, the pointer should move to the cell directly below in the same column.

Impact of fix

Fixing this bug would improve table features, benefiting many users who use table and cell-merging features.