Add spoilers with |block=yes everywhere!
It should work like
{{Coop walkthrough table
| atlas-1 = Steps for Atlas ONLY.
| pbody-2 = Steps for P-body ONLY.
| both-3 = Steps for both Atlas and P-body.
}}
instead of old
{{Coop walkthrough table
| atlas-1 = {{Spoiler|block=yes|Steps for Atlas ONLY.}}
| pbody-2 = {{Spoiler|block=yes|Steps for P-body ONLY.}}
| both-3 = {{Spoiler|block=yes|Steps for both Atlas and P-body}}
}}