The glowshrooms only spawn in big version and not in small version as they did on 1.7.10 version. I had a suggestion too to make spawn big version of red and brown mushrooms.

They are not producing any light for me, are they working for you?

Oh it's right they don't do.

In 1.7.10, the only time the small glowshrooms spawned in the nether was when you had the nether being overwritten by the Netherite dim.

natura-1.10.2-4.1.0.53 has this!