Magma Blocks Issue

Magma blocks are not created in Nether I think. Does anyone feel so? But, Magma Blocks is created correctly at Single Play.

I use these mods:
spongeforge-1.11.2-2201-6.0.0-BETA-2061
(with forge forge-1.11.2-13.20.0.2201-universal )
BiomesOPlenty-1.11-6.0.1.2134-universal
armorplus-1.11.2-9.5.2.3-beta
AbyssalCraft-1.11-1.9.3.9
chiselsandbits-13.9
CosmeticArmorReworked-1.11.2-v1
journeymap-1.11.2-5.4.4
LuckPerms-Sponge-2.17.11
MoreDyes-1.11-1.1.1
Nucleus-0.20.0-S5.1-1.10.2-plugin
NucleusMixins-0.15.0-S5-mixinplugin
projectportals-5.1.0-0.13.6
projectworlds-5.1.0-0.11.4
thedragonlib-1.11.2-2.1.0
TotalEconomy-v1.5.3

Hello, we have the same problem on our Server…
We started at 1.10.2 and we are now on 1.11.2 and tried to search in newly generated chunks but no luck.
In Single Player and the same Seed the Magma Blocks are generated normally.

We only have a few mods/plugins installed like Dynmap, Nucleus, PermissionManager on SpongeForge. As far as i can say these do not cause the problem.

I don’t find any other threads speaking about this problem so maybe not everyone has it?

best regards
Flo