Seems we were leaking mipmap->mipmap_texture and mipmap->fb. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2562>
Relating to b29a6c4d, 16fa2100, 877dc335 The most recent mipmapping logic was written by Canonical and rearranged by Neil Moore. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2535>
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Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2506>