Error: conflicting intervals specified - Bullseye 0.9.8

[Daniel <tech@xxxxxxxxxx>]

Hi,

I get the following error with the above nft version, lan being the 
interface name:

add element ip6 nat fwdtoip_tcp.lan { 1-65534 : 2001:db8:27b:10:ff9b::, 
1-65534 : 2001:db8:27b:ff9b::c0a8:ad1}

with

add map ipv6_addr nat fwdtoip_tcp.lan { type inet_service : ipv6_addr\; 
flags interval\; }

What's wrong here ? My goal being to redirect all (or range ports) 
external traffic to another server.

Thanks for any hint
--
Daniel