I'm not sure whether it was purely visual or not, the combat result didn't depend on the edge, but there was no edge indicator on the first turn of bamboo and presumably no edge.
#Lum bamboo didn't give edge on the first turn
lapis vault
silk sable
Confirmed, this happens when you play a Bamboo during the main phase, through the Gimme A Jackpot ability. I'll fix this, thanks.