Like the title says, a list that stores a custom inner class does not seem to save its values or new additions to the list. This behavior is reproducible using the ExampleConfig provided as well. Simple lists work as expected.

To reproduce: Add or change a value in a complex list

public List complexList = Arrays.asList(new PairOfInts(0, 1), new PairOfInts(3, 7));
Add or change an entry, then save and exit. Also must exit out of the modmenu screen (if using modmenu).

Expected behavior: The complex list should store the new values in the config file and be there when the screen is reopened

Actual: The new values don't save to file and the complex list defaults to the default values and entries when loaded.