Blockstats and blockchaininfo command missing

I'm trying to get some meta data for the blockchain and I'm running into some issues. When I run getblockstats, I'm getting a method not found error even though it was added in the patch notes. When I use getblockchaininfo, I get a result, but the size_on_disk field is missing. Why is this?

Extra info:
Version: 386-v0.21.0-beta for windows
I'm using testnet and I'm running the 0.21.0 exe on the datadir that was formed with the 0.20.0 version