I've been building a platform made of solid glass in an ocean and since it's glass, didn't put effort into lighting every spot considering that the wiki says it's impossible for mobs to spawn on glass. Yet sometimes when I reload a chunk by entering a seperate one a mob ( mostly hostile e.g.: skeletons, Creepers! Or spiders) seem to be spawning. It's annoying since the 2 spots they seem to be spawning on are close to my chest and i don't think I need to address the stress when seeing a creeper next to your valuable resources