I entered China using L visa with double entries last month. If I changed it to F visa with single entry, will my L visa with double entries be canceled?

I entered China using L visa with double entries last month. If I changed it to F visa with single entry, will my L visa with double entries be canceled? Even when I only use it once to entered China last month?

I'm also planning to go to Philippines for a week this month. Will there be any problem when I want to go back to China? (considering that my visa is now F visa with single entry)