Materials from Ender IO when added to the shut-down materials simply do not work.

Yeah thats the event im using for this. And from a code point of view im registering my handler for this event in the pre init so i dont think order would br a issue unless ender io does register its tinkers stuff in the pre init and just happens to run before my handler runs

There we have it...

I'd recommend you use @EventBusSubscriber to register your event handler. That way you never miss an event that is fired "too early".

(It'd be even better if TiC was to use the Register<> event for materials instead of us having to call in at weird times. But that'd be a major change to their registration system...)

Mod integration stuff should always be done in the post init tbh

Im willing to do before:enderio if ender io needs to register mod integration stuff in pre init

Which event? MaterialEvent.MaterialRegisterEvent? That one should be fired regularly...

You need to give more detail on the issue. Your one line isnt going to cut it

I added to "List of Materials to be disabled" and these materials will not be disabled from Ender IO.
energetic_alloy
vibrant_alloy
redstone_alloy
conductive_iron
pulsating_iron

Sorry for the delay, im currently looking at the issue.

Please report to Ender IO, as im just listening on a Tinkers Construct event, and it seems Ender IO doesnt fire this event?

Here is the proof, these are all the ones thats seen by the event:

Material: wood
Material: stone
Material: flint
Material: cactus
Material: bone
Material: obsidian
Material: prismarine
Material: endstone
Material: sponge
Material: firewood
Material: iron
Material: pigiron
Material: knightslime
Material: slime
Material: blueslime
Material: magmaslime
Material: netherrack
Material: cobalt
Material: ardite
Material: manyullyn
Material: copper
Material: bronze
Material: lead
Material: silver
Material: electrum
Material: steel
Material: string
Material: slimevine_blue
Material: slimevine_purple
Material: vine
Material: blaze
Material: reed
Material: ice
Material: endrod
Material: feather
Material: slimeleaf_blue
Material: slimeleaf_orange
Material: slimeleaf_purple
Material: leaf

Please let them know they can contact me if they need anything from me/need me to do on my side