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this issue is a duplicate of bug 2096386.
The fix for bug 2096386 has two parts.
Both parts will be fixed for good in rhel-8.8.
The first part also is already in rhel-8.7-GA.
The second part is not yet in rhel-8.7.z, so let's reopen this Z-stream bug.
Also, both parts are backported to rhel-8.6.z (bug 2132282).
Reopening.
VERIFIED with NetworkManager-1.40.0-2.el8_7: the duplicate address is detected and removed.
Bug is checked by NM CI scenario ipv6_may_fail_no_wait_for_dad_dhcp
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 (NetworkManager bug fix and enhancement update), 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-2023:0098