Redis config update changed min-slaves-to-write to 1

Our redis configuration has 1 master and 1 slave node with min-slaves-to-write as 0 in both nodes. There was a disk shortage issue in master and the slave was promoted as master but min-slaves-to-write was changed to 1 and the redis stopped working. How or when does redis changes the configuration of min-slaves-to-write as 1.We are using redis sentinel to connect to redis from application servers