This just happened to me on TC.
replica_test.go:1206: unexpected error obtaining lease for invalid store: cannot replace lease repl=(n1,s1):1 seq=1 start=0.000000000,0 exp=1.800000124,3 pro=0.900000124,4 with repl=(n2,s2):2 seq=0 start=0.900000124,0 exp=0.900000134,0: requested lease overlaps previous lease