Does Bhutan grant visa-free treatment to China?

Bhutan is the only country in Asia that has not established diplomatic relations with China, but it has always supported our country. It was once a vassal state of our country. This country is Bhutan, one of the least developed countries in the world and the country with the highest happiness index in Asia. Because Britain colonized Bhutan before and India inherited Bhutan's diplomacy after World War II, Bhutan has never established diplomatic relations with China, but Bhutan has a good relationship with China and has always supported China.