Feature not generating when checking for solid block

Ive been trying to get this feature placement to work for hours now and cant figure out what im doing wrong. I made a structure that is a singular custom storage block with a loottable and wanted to have it spawn via feature because its supposed to be quite common and im afraid normal structure generation will cause performance issues.

After i removed the "Only if condition [Block at position offset by x:0 y:-1 z:0 is solid] is met" block it suddenly started generating, but floating in the air which i wanted to avoid. When i add the block back then it no longer generates.