Is it bad sharing the 1s on same tent?

As was said Its ok but if it's autoflower and ur bugged is for this enough I would prefer 18/6 light cycle. Grow once at 6h light and then 16h and u will see the difference for yourself 🙏🌱

No not bad! If possible I prefer 18/6 for the vegging phase because the plant will develop better and will give a better yield. But there is nothing wrong with 12/12 from the start you just miss 6 hours growth per day during the vegging phase thats all.