Pool Party Ziggs Invisible Bombs

I was playing a game of ARAM against a Ziggs with the Pool Party skin and around the time he got his Rabadon's Deathcap his bombs suddenly turned invisible, this was also noticed by a teammate of mine.

• His Q was invisible but you could see where it was bouncing through the splashes
• His W was invisible until it landed
• His Ultimate was Invisible entirely but still left the red circle on the ground This is the 1st time I have seen it happen with Ziggs but I have also seen something similar happen with Sorceress Lux's E in ARAMs as well.