Chinese wall building time

Chinese the current wall repair time is 5s (10s halved), which is the slowest in the whole nation (4s for other ethnic groups), is this a setting or a bug

The wall sealing time in China is 5 seconds (10 seconds reduced by half), while in other civilizations, it is 4 seconds. Is it a bug

Should be a fix coming for this one. Thanks @zhangchenking79.