When sending to an address on Testnet, browser extension wallet shows a warning that the address is a private key

[aaronTufts]

On Chrome Version 136.0.7103.114, when I

1. Copy an arbitrary sender or receiver address from a recent transaction on Testnet Aptos Explorer
2. Open my Petra wallet browser extension, switch my network to Testnet, click send, and paste the address

I get a warning that the value is a private key:

When I do the same for a Mainnet Aptos Explorer transaction sender or receiver, and with my Petra wallet browser extension set to Mainnet, I get no such warning.

I also don't get a warning on the mobile app when it's set to Testnet.