I just recently got on my test world for farms, Redstone contraptions, and etc.
I have this Iron Golem farm I am testing out, but I noticed the glow squids were spawning at a light level of definitely more than 0. Also they where spawning at water levels of 1 block tall and less. The screenshot only shows one but there where 5 or more in there. I know other people have said this about the 1.18.1 pre-release but its still happening.