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Will it cause problems when websites start going ipv6 only?
It can be a problem. IPv6 relies on something calling PMTUD (Path MTU Discovery) to work. Blocking ICMPv6 prevents PMTUD from working. Unfortunately, unblocking ICMPv6 has a downside. It can expose your devices to a certain kind of DoS attack (atomic fragment attack). This puts you in a "Damned if you do. Damned if you don't." situation. There is work ongoing in the IETF (the standards group for TCP/IP Protocols) to figure out how to fix this.
In the meantime, you may find that things will work even without ICMPv6. Consider yourself lucky.
Will it cause problems when websites start going ipv6 only?
It can be a problem. IPv6 relies on something calling PMTUD (Path MTU Discovery) to work. Blocking ICMPv6 prevents PMTUD from working. Unfortunately, unblocking ICMPv6 has a downside. It can expose your devices to a certain kind of DoS attack (atomic fragment attack). This puts you in a "Damned if you do. Damned if you don't." situation. There is work ongoing in the IETF (the standards group for TCP/IP Protocols) to figure out how to fix this.
In the meantime, you may find that things will work even without ICMPv6. Consider yourself lucky.
Who is your service provider? My ICMP wasn't working. Turns out it was due to ATT's RG. Even in passthrough/DMZ+ mode, their RG blocks protocol 41 and cripples IPV6. If you bypass their RG using a VLAN switch, you can have your router's WAN directly connected to the ONT. Using this method with proper 6RD settings makes it work. ICMP is reachable now. I get 19/20 now. The only reason I'm not getting 20/20 is due to the lack of RDNS for ATT.
