Check the current prefix policy:
netsh interface ipv6 show prefixpolicies

To make IPv4 the preferred option, increase its precedence with this command:
netsh interface ipv6 set prefixpolicy ::ffff:0:0/96 60 4
If you need to return to IPV6 priority run this command:
netsh interface ipv6 set prefixpolicy ::ffff:0:0/96 35 4