An update: Your suggestion ultimately solved the issue. While I had cleared the override on Other Income Statement and Schedule 1, there remained an empty overridden field on 1040 Worksheet! There was no entry in that field anymore, but as you said, the override was still in effect. I suppose the logic is that "no entry" could very well be something someone wanted to override to.
Once I cancelled the override on 1040 Worksheet, even though empty, everything flowed.
Thanks!
