Minecraft wiki entry for Air, associated text: Has this ever existed in Bedrock Edition? https://minecraft.fandom.com/wiki/Direct_item_forms_of_blocks?type=revision&diff=1946039&oldid=1946013 seems to imply so
Apparently air item entities can be generated in 1,4 - early 1.5 dev.p via jukeboxes
Dropped by giants?. 