Other mod tries to access my capability

[fr3qu3ncy]

Hey! I get this error when trying to load my mod together with a few others:

de.fr3qu3ncy.shadowmobs.caps.BooleanCapability cannot be cast to com.robertx22.age_of_exile.dimension.dungeon_data.WorldDungeonCap
	at com.robertx22.age_of_exile.uncommon.datasaving.Load.dungeonData(Load.java:38) ~[mmorpg:?] {re:classloading}
	at com.robertx22.age_of_exile.event_hooks.ontick.OnTickDungeonWorld.onEndTick(OnTickDungeonWorld.java:13) ~[mmorpg:?] {re:classloading}

How can the other mod access my (BooleanCapability) cap? It is loaded by World#getCapability and the capability has a unique resource location, both caps are attached in CapabilityAttachEvent<World>.

The BooleanCapability class doesn't even exist in age_of_exile.

Other mod's code: https://github.com/RobertSkalko/Age-of-Exile/blob/c5740a9cca788b8d02d904ca5230f34381e25d43/src/main/java/com/robertx22/age_of_exile/uncommon/datasaving/Load.java#L36

My code: https://pastebin.com/KknmYrpc

[MFMods]

it is okay for other mods to access your capabilities - assuming both developers know what they're doing.

i don't feel like looking at source code of either mod, but i can tell you that authors of cold sweat mod had the same issue with half a dozen other mods, including the exile-whatever mod. they changed something two months ago and cut the list of incompatible mods by half. maybe you could ask them about it on their discord?

[Draco18s]

Your code is faulty.

        @Nonnull
        @Override
        public <T> LazyOptional<T> getCapability(@Nonnull Capability<T> cap, @Nullable Direction side) {
            return implementation.cast();
        }

Me, accessing a restaurant's website: "Hello, yes sir, I would like to see your menu."
You, the restaurant owner: "HERE'S MY FRIDGE"

The whole point of the cap parameter is so that you know which capability is being asked for. If you aren't being asked for your capability, don't return YOUR capability.