Hi,
I found an issue working with the AvailableAmount tag. When I add products to the Cart, the reserved value is deducted from all units, instead of only being deducted from the unit I added to the cart.
See the video below:
https://www.screencast.com/t/l5MVhOsQD2
Note: I didn't show in the video, but this works well with variants. When I added a variant to the Cart, it only deducted the stock of the choosen variant.