Due to the COVID-19 pandemic, China has decided to temporarily suspend entry of non-Chinese nationals travelling from Bangladesh, holding visas or residence permits still valid at the time of this announcement.
 
The Chinese Embassy in Bangladesh will no longer issue Certified Health Declaration Form for the above-mentioned personnel, said the embassy in a post shared on its verified Facebook page on Thursday.

Entry by holders of diplomatic, service, courtesy or C visas will not be affected.

https://www.dhakatribune.com/bangladesh/2020/11/05/china-to-suspend-entry-of-non-chinese-nationals-from-bangladesh