3+ blocks in array breaks code

[se6a]

Bug Report

Hi there

When adding a third item to an array field, I get following error in the console:
Uncaught TypeError: Cannot read properties of undefined (reading 'ignoreWhileFlattening')
at fieldReducer.js:16

Occurring if
-Array contains only blocks
-Array contains only nested arrays
-Array contains a block and a nested array (or more)

Not occurring if
-Array contains block(s) and a text field
-Array contains nested array(s) and a text field

You can check here:
[email protected]:se6a/payload-blocks-in-array.git

Expected Behavior

Current Behavior

Possible Solution

Steps to Reproduce

1. Define new collection type x
2. Define a field y of type array for collection x
3. Define a nested array for field y
4. create new collection x in the admin panel
5. add 3 items to the array

Detailed Description

[jmikrut]

Hey @se6a — thank you for the report! We can slot this into our workload coming up shortly.

[github-actions]

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