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This excerpt from the nft man page:

RULES
       [add | insert] rule [family] table chain [position position] statement...
       replace rule [family] table chain handle handle statement...
       delete rule [family] table chain handle handle

seems to imply that "insert ... position .." should use an offset into the ruleset, but it actually takes a handle just like delete/replace verbs.

At minimum the man page should be fixed to read something like

       [add | insert] rule [family] table chain [position handle] statement...
                                                          ^^^^^^
to make it clear this is handle, not an index (like iptables).

Upstream commit to backport:

commit effb881c9cef28aca47adeec5014e0457507539e
Author: Phil Sutter <phil>
Date:   Wed May 9 16:03:40 2018 +0200

    Deprecate add/insert rule 'position' argument
    
    Instead, use 'handle' keyword for the same effect since that is more
    consistent with respect to replace/delete commands. The old keyword is
    still supported for backwards compatibility and also listed in man page
    along with a hint that it shouldn't be used anymore.
    
    Signed-off-by: Phil Sutter <phil>
    Signed-off-by: Pablo Neira Ayuso <pablo>

Based on our e-mail communication, I've just written a draft of a RN description in the Doc Text field. Could you please check it?

Hi Mirek,

(In reply to Mirek Jahoda from comment #7)
> Based on our e-mail communication, I've just written a draft of a RN
> description in the Doc Text field. Could you please check it?

Looks good to me, thanks!

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3154