Small issue in the DataContainer of your GrowthChamber BE

[RINGULARITTY]

@Override
public void set(int i, int value) {
    switch (i) {
        case 0: GrowthChamberBlockEntity.this.progress = value;
        case 1: GrowthChamberBlockEntity.this.maxProgress = value;
    }
}

It should be -> insted of :

[emperor06]

That's not a return switch, it's a regular switch so : is correct.

On the other hand, it's missing a break after each case ;)