Can't stack same-material sheets

[Dabir]

Tried to drag steel sheets onto a steel sheet I was holding to stack them all up, got the message "You can't stack different materials!" OK, but I wasn't trying to.

[hipBEE]

I had this happen with glass sheets last night while trying to repiar the diner teleporter

[Dabir]

Now I can't stack steel-reinforced steel sheets with other steel-reinforced steel sheets even by clicking on them.

[ISaidNo]

this should be fixed