For example:
.shape(
"#R#",
"PMP",
"GMG"
)
.key('#', item('minecraft:air'))
This works fine when I map # to minecraft:air, but if I try:
.shape(
" R ",
"PMP",
"GMG"
)
and omit the key for the space (expecting it to mean "empty"), it fails.
[SERVER/ERROR] [postInit.forestry:38]: - key ' ' is not defined