On the enemy that locks some of your tiles, you can still put a reagent there if you choose a recipe that has ???? and then right-click the components to make them go to the board. I didn't check if it's possible to actually combine them once they're there.
Repro steps:
Go to enemy that locks the middle tile
Choose a recipe with 4 question marks
Right click the element in place
On the enemy that locks some of your tiles, you can still put a reagent there if you choose a recipe that has ???? and then right-click the components to make them go to the board. I didn't check if it's possible to actually combine them once they're there.
Repro steps:
Go to enemy that locks the middle tile Choose a recipe with 4 question marks Right click the element in place