As I understand it, and that understanding could be flawed, burning up a lot of satellites containing a lot of substances not usually found in our upper atmosphere may have consequences. No-one has done the due diligence to know whether this is the case or not. Or if these consequences would be significant for us.
Also, "re-entered" might not mean burning up fully.
If you get a bug there are a lot of solutions on their Discord. The join link is on their main page: https://fallout4london.com/