Meld cards unsupported by blink effects?

Found a strange code in [[Essence Flux]] and another few cards, search problem code by `instanceof meldcard`:


Most of the exile and return effects like `ExileThenReturnTargetEffect` uses a simple return code (main card usage):

Need to research:
* Are meld cards bugged with standard blink effects?
* Is that code can fix it?
* Are there a simpler solution without workaround (e.g. some fix in game engine, not effect/card)?