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Should be fixed by the following upstream commit:

commit 483e5ea7167e1537accf4cb083b88a8beea8f834
Author: Florian Westphal <fw>
Date:   Tue Mar 27 09:29:54 2018 +0200

    src: avoid errouneous assert with map+concat
    
    Phil reported following assert:
    
    add rule ip6 f o mark set ip6 saddr . ip6 daddr . tcp dport \
                            map { dead::beef . f00::. 22 : 1 }
    nft: netlink_linearize.c:655: netlink_gen_expr: Assertion `dreg < ctx->reg_low' failed.
    
    This happens because "mark set" will allocate one register (the dreg),
    but netlink_gen_concat_expr will populate a lot more register space if
    the concat expression strings a lot of expressions together.
    
    As the assert is useful pseudo-reserve the register space as per
    concat->len and undo after generating the expressions.
    
    Reported-by: Phil Sutter <phil>
    Signed-off-by: Florian Westphal <fw>

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