Exceedingly minor so I'm not gonna PR it, but the crafting recipe for the titular block in \recipes\stonecutting\caution_blocks\light_blue_caution_block.json contains a typo on line 7 that renders it impossible to craft:

"result": "tfmg:ligh_blue_caution_block",

It's missing a 't' and should be

"result": "tfmg:light_blue_caution_block",

actually a bunch of items actually are uncraftable in the most recent version apparently, found this out by looking for the lightbulb recipe