Grue ignores difficulty setting.

[MagusLucius]

Grue ignores difficulty setting on server, and spawns in overworld, in broad daylight.

Daylight Grue is disabled in config

• Minecraft: 1.12.2
• Forge: 14.23.5.2838
• Grue: 1.4.0

I logged into a brand new server, on which I had just set the difficulty to 0 from the console, and the grue jumped me immediately. I was standing in the middle of a snowy biome, in broad daylight.

[Shinoow]

I can't reproduce this, apart from the Grue managing to kill you in peaceful (since it manages to be around just long enough to deal damage to you). Since it managing to kill you in peaceful is in violation with the principle of peaceful (eg. monsters not spawning), I'll make it so that they don't spawn in peaceful.
There's gotta be something more than standing in the middle of a snowy biome in broad daylight, as I get no Grues spawning under those conditions, neither in singleplayer nor a server.