Turn off IPV6?

I appreciate that ProtonVPN offers ipv6 support for their linux client, however my home internet (Tmobile) doesn't work at all when ipv6 is turned on

So I have to turn it off via settings:

IPv6 Tunnels IPv6 traffic through the VPN. Can enhance compatibility with IPv6 networks.

My question is, does turning it off post any privacy risk, e.g. IPv6 leak? or compatibility issues in general?

Thanks!