TypeError: Argument 2 passed to Drupal\layoutcomponents\Entity\LcEntityViewDisplay::arrayInsert() must be of the type int, null given [#3260622]

My context is special, i inherited a project built by someone else.

The fact is that there are fatals that happen on some pages built with Layout Builder, throwing that type of error:

TypeError: Argument 2 passed to Drupal\layoutcomponents\Entity\LcEntityViewDisplay::arrayInsert() must be of the type int, null given called in modules/contrib/layoutcomponents/src/LcDisplayHelperTrait.php on line 88 in Drupal\layoutcomponents\Entity\LcEntityViewDisplay->arrayInsert() (line 189 of modules/contrib/layoutcomponents/src/LcDisplayHelperTrait.php)

Issue fork layoutcomponents-3260622

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3260622-typeerror-argument-2 changes, plain diff MR !2
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