BitShares Testnet version `test-6.1.2` was released today: https://github.com/bitshares/bitshares-core/releases/tag/test-6.1.2 , with a fix to a logging issue introduced in version `test-6.1.1`.
All Testnet nodes are recommended to be upgraded, although not required.
More info on the release page (release notes, binaries, docker and etc).