In WebKitGTK before 2.32.4, there is a use-after-free in WebCore::Frame::page, a different vulnerability than CVE-2021-30889.
The MITRE CVE dictionary describes this issue as:
In WebKitGTK before 2.32.4, there is a use-after-free in WebCore::Frame::page, a different vulnerability than CVE-2021-30889.