Can't save MaterialInstanceDynamic created via C++

anonymous_user_a4ea03db
Tue, 09 Jul 2019 22:38:23 +0000
Rendering

Can’t save D:/Documents/Programming/Unreal/DMI_Bug/Content/MyMap.umap: Graph is linked to private object(s) in an external package.
External Object(s):
MaterialInstanceDynamic_0

Try to find the chain of references to that object (may take some time)?

I’ve reproduced the bug in a standalone project and attached it here.
To get the message, simply create an instance of MyActor (a C++ class) and then save.

link text

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