[1.20.1] Weird problem with parsing my config.

MOB_SPECIFIC_OVERRIDES = builder.defineListAllowEmpty("MOB_SPECIFIC_OVERRIDES", () -> Lists.newArrayList(""), e -> e instanceof String && ((String) e).contains(":") && ((String) e).contains(","));

For some reason the above line causes my config to fail to parse and throws this error:
 

Quote

List on key MOB_SPECIFIC_OVERRIDES is deemed to need correction. It failed validation.

If someone could help me with understanding why this fails to parse, that'd be great.

This is the rest of my config. Click here.

 

Edited April 5, 20241 yr by TheBlueEyeOfEnder
Forgot to include the rest of my code.