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We need to backport this upstream patch:

commit 61595e3d36ded374f97961503e843a314b0203c2
Author: Andreas Schwab <schwab>
Date:   Tue May 15 14:42:37 2018 +0200

    nscd: avoid assertion failure during persistent db check
    
    nscd should not abort when it finds inconsistencies in the persistent db.

Verified by corrupting a record of /var/db/passwd file:

on glibc-2.28-69.el8 nscd crashes:
 nscd: connections.c:307: check_use: Assertion `len >= 2' failed.
Aborted (core dumped)

on glibc-2.28-70.el8 nscd reports about invalid DB and continue works:
 invalid persistent database file "/var/db/nscd/passwd": verification failed

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/RHSA-2019:3513