Fix `0011-async-backing-6-seconds-rate.toml` - set `lookahead` to 3 otherwise...
Fix `0011-async-backing-6-seconds-rate.toml` - set `lookahead` to 3 otherwise the chain can't progress in time
Fix `0011-async-backing-6-seconds-rate.toml` - set `lookahead` to 3 otherwise the chain can't progress in time