Meltano

Hello, we're encountering problems while handling a nested field that is not present in every record.
We're using "typing" and building a schema with PropertiesList for a stream named "orders"

The field which is raising the warning is named "OrderTotal" and has two child-entries "CurrencyCode" and "Amount".
Our structure is the following:

`schema = th.PropertiesList(`
    `th.Property("...", th.StringType),`
    `...`
    `th.Property("OrderTotal", th.ObjectType(`
        `th.Property("CurrencyCode", th.StringType),`
        `th.Property("Amount", th.NumberType)`
        `)`
    `),`
    `...`
`)`

When we run the tap, we receive the two following warnings, only once per run:

`time=2021-06-23 13:30:20 name=tap-test level=WARNING message=Catalog entry missing for 'orders':'('properties', 'OrderTotal', 'properties', 'CurrencyCode')'. Using parent value of selected=True.`
`time=2021-06-23 13:30:20 name=tap-test level=WARNING message=Catalog entry missing for 'orders':'('properties', 'OrderTotal', 'properties', 'Amount')'. Using parent value of selected=True.`