AnyObject subscript gone in 5.3?

Using Swift
1

On Xcode 11 I had code in tests that looks like:

internal func fixtureWithName(_ name: String, ofType: String) throws -> Data
internal func fixtureWithName(_ name: String, ofType type: String) throws -> String
internal func fixtureWithName(_ name: String) throws -> AnyObject

and used like

let JSON = try? fixtureWithName("...")["body"]

Now in Xcode 12 I get an error in the usage line:

Ambiguous use of 'subscript(_:)'

I can change the code to workaround that but I wonder what has change between versions. Could somebody point me to a proposal that changed this behaviour? Cheers.

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