When is a table forced read-only?

I have an editable table with a BeanItemContainer where Foo has getters and setters for all properties and it works fine.

I have another table with the same setup but there I have a ReadOnlyFoo with only has getters and then I have an EditableFoo whichs extends ReadOnlyFoo and adds one property with a getter and a setter but the entire table still adds “readonly” to all text fields. Any ideas why? One would think that the field from EditableFoo could be edited just fine(?)

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