If i use normal UMyGameInstance : UGameInstance, and set this into Project settings->Maps&Modes->Game Instance, and then Editor->Launch my project, then everything is fine.
But if i create Blueprint subclassing UMyGameInstance, and set this into Project settings->Maps&Modes->Game Instance, then Editor->Launch crashes, logs says: “GameInstance class not found” etc…
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I was able to reproduce your issue and have submitted it as TTP# 348084 into our tracking software. Our developers will be looking into it and we will post back here with an update as soon as possible.