Just downloaded the 2.0.1 version of the Daedalus Testnet Wallet.
On a Mac / Catalina 10.15.2
Download went smoothly, but once again, when open the Reward / Staking wallets were empty even though in the Delegation Center the funds showed as “staked” to unknown pools.
I deleted the Daedalus State Directory through the HELP/DAEDALUS DIAGNOSTICS/OPEN STATE DIRECTORY link. Restarted the Test Wallet and had to Restore the main Balance Wallet and the 2 Reward Wallets I had previously created.
All good after that - and reward amounts were not effected - but not something one wants to have to do every time Daedalus is updated.