Getting exactly the same error, just the module is different...
https://www.drupal.org/project/layout_builder_at/issues/3076759

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PlayfulWolf created an issue. See original summary.

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playfulwolf commented
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Related issues: +#3076759: Error when using the Layout builder widget & going to the node edit page
playfulwolf’s picture

playfulwolf commented
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vflirt commented

I am facing the same issue :( There is no documentation how to configure and be able to translate the labels of the attached custom blocks in layout override on an already created node.