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Solved the issue by removing the

@TaskAction

from TaskA and just using a method

ConfiugurableFileCollection

is already a lazy type: https://docs.gradle.org/current/userguide/lazy_configuration.html#working_with_files_in_lazy_properties There is usually no reason to wrap it into a

Property

additionally. Why it is empty in B is hard to say without seeing more of the code of A and B and the wiring.