Comment # 1 on bug 1162666 from Thorsten Kukuk

(In reply to Luca Billi from comment #0)
> As of Tumbleweed 20200201, /etc/services has moved to /usr/etc/services.
> However, some programs still relies on the old location and currently fails.
> Here's a partial list:
> - postfix
> - nftables
> - exim
> 
> A symbolic link is currently a valid workaround.

/etc/services is read via a glibc interface, not directly.

Could it be that you have /etc/*.rpmsave and /etc/*.rpmnew files? Especially
for /etc/nsswitch.conf? Please merge them!

nftables at least is not reading /etc/services directly.