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Since I use 4.8 all function nodes produce errors after adding a new input or output to the function, I need to replace them all manually then because the pins don’t get added automatically. I think in 4.7 that was not needed, right? Quite annoying,
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In 4.7.x it happened as well.
I had a post about this: https://forums.unrealengine.com/showthread.php?68535-Annoying-BUG-in-blueprint-system&highlight=annoying+bug
Back then the issue was logged as UE-15076.
Perhaps it has resurfaced?