Hello, this is the current version for 22. As far as moisture goes, each fill type should have it's own saved moisture value per bin. If a placeable has a configuration or uses state control, then how that works is in the hands of whoever set up the placeable.
If you are not able to add more fillTypes to a bin, that's because the bin was set up that way in the placeable.xml file. The moisture system alone should only track each fill type's moisture value, not what can go where.