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I think this is an indication that there's a bug in the Mac FTB app. I'll provide a bit more details:
MacOS version: 10.15.4
Modpack: Stoneblock 2
Using FTB app: yes
Full log: https://pste.ch/qijilulazi
I just signed up an account to report the same thing, this is the second time it has happened with the ftb app. What's different from OP is I didn't even shut down my laptop.
