If a person dies from Corona virus then the Deceased is Prayed over only: no ghusl or tayyamum.
Ghusl will pass on the virus so this is why it should not be performed.
Tayyamum cannot be performed over a deceased because they come in a plastic bag and pure soil has to touch the skin. The person who dies in plague is like a martyr and they are Buried as they are without ghusl but are prayed over.
The deceased is prayed over and buried or buried then prayed over. This is based on hanafi and Maliki fiqh principle al darar ujzal / harm is avoided.
People who wash deceased person[s] and then die themselves are not martyrs. Just like a person who does not eat anything haram then dies because of it. In a dire situation of life and death even pork can be consumed to save ones life.
The shariah is meant to protect life and not endanger it.
Also many people can be prayed over at once, this is permissible.