[1.20.2] Error when overriding TheEndBiomeSource with custom BiomeSource

To sum up the mod's aim I'm essentially trying to overwrite the `TheEndBiomeSource` class for the End dimension with my custom `MultiNoiseBiomeSource` class like the Nether and Overworld dimensions which will allow me to customise it more flexibly. 

https://gist.github.com/InvictusSlayer/355bd6b9757697a8c6c3b458aa2b782d

In the log file you can see the error is caused by: 

Missing key in ResourceKey[minecraft:root / minecraft:worldgen/world_preset]: ResourceKey[minecraft:worldgen/world_preset / minecraft:normal]

This key would usually be initialised in the `WorldPreset$Bootstrap` class where I am injecting my code into. But for some reason my code is disrupting the [:runData] cycle and preventing this key from being initialised. I am sure that it is not an issue with the Mixins as the ".mixin.out" files look how I would want them to (it won't let me add these to the gist but I can ss if needed).

I am quite clueless as to where my issue is as I have inherited my `TheEndMultiNoiseBiomeSource` class from the vanilla `MultiNoiseBiomeSource` class, while only injecting into classes with my custom `MultiNoiseBiomeSourceParameterList$Preset` where the vanilla Nether and Overworld do. 

Any insight into what I have missed or if there is some element to the [:runData] cycle I am not aware of would be much appreciated.