No it’s not. Here’s an instance where vaccines helped spread polio:

https://www.theguardian.com/global-development/2020/sep/02/vaccine-derived-polio-spreads-in-africa-after-defeat-of-wild-virus

The mRNA vaccines were different than this though (not using a live virus), but mRNA is a newer method that hasn’t had the same level of testing as other vaccines. Probably good to take some precautions, especially when the virus in question (covid) has a 99% survival rate