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I wondered why Orbot does not use IPv6 routing but Tor Browser access IPv6 sites fine, while both android and badvpn support it very well.

After looking into code i found the line at:

https://github.com/n8fr8/orbot/blob/56917567cd21a734a35f3bee0e56ba23793b6887/orbotservice/src/main/java/org/torproject/android/service/vpn/OrbotVpnManager.java#L327

commented out :( :

			        //handle ipv6
			        //builder.addAddress("fdfe:dcba:9876::1", 126);
					//builder.addRoute("::", 0);

Tor Browser speaks directly to socks5 of tor with IPv6 and not over tun2socks vpn translation. That's why you can actually access IPv6 Websites but not for tunneling any other application connection to IPv6.

tun2socks just requires argument:

--netif-ip6addr fdfe:dcba:9876::2

if

fdfe:dcba:9876::1

will be address of virtual interface