Was this tested on -stable before pushed? I ask because 10.1.0 has a bug that needs to be fixed. See https://github.com/NetworkConfiguration/dhcpcd/issues/407.
Currently I’m running master with the following commit reverted https://github.com/NetworkConfiguration/dhcpcd/commit/e3c5de14f01227f53b3fb87b76e1dd0e69722981, and everything works as intended.