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I reproduced the bug with tigervnc-1.12.0-10.el9.x86_64 and verified with tigervnc-1.12.0-11.el9.x86_64
No crash when closing down vncviewer.

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 (Moderate: tigervnc security and bug fix 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/RHSA-2023:2257