What does your journal say about Forgotten Lore? Is it marked as completed, or maybe got stuck somewhere?
If it is completed and the grates are still closed after sleeping at an inn, then this may indeed be a bug. But let's first rule out all other possibilities.
Forgotten Lore is marked as completed in my journal, and I stated earlier, I even returned later to see if the grates we're open.....they weren't, but I guess I'll check again when that character is near New Garand
Try to talk to anton again it happend to me but with the girl she fllowed me but it was considered as mission completed until i talked to her again could be the same issue but with anton insteas and make sure you completed the quest forgotten lore with her being alive and not dead