I changed to U6000.5.0f1 and AC1.86.4. In the actiolists in scene starting with custom node the first item was lost. And when I added again the right node I couldn't set it to first - setting first didn't work at all.
But after clicking the actual gameitem it somehow reseted the actiolist editor and another node was set first and then I was able to set the correct first.
I don't know it it was that I had a custom AL node that was put into Dialog group or not. But for future I changed custom AL group into custom.
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What version were you previously using?
If you reset the ActionList editor, does that fix the ActionList? Check the Console for related messages.
From U6000.4.11f and AC1.86.3. I already fixed the broken ones and this bug seems to only have affected the open scene, so can't test it.