LogCook: Error: Content is missing from cook. Source package referenced an object in target package but the target package was marked NeverCook or is not cookable for the target platform.

For all of you still facing this issue it has been resolved in 5.4.2.
Found last in the change list → 5.4.2 Change List
[UE-213910 Cook error (Content is missing from cook) raised when cooking deep blueprint hierarchy]

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