gnome-control-center shows 120Hz display frequencies that the display doesn't support (really only 60Hz hardware)

Upstream:
https://gitlab.gnome.org/GNOME/mutter/issues/275

seems the issue is in the backend and not the settings?

Maybe, maybe not. I haven't verified that yet since gnome-control-center is presently the only thing reporting bogus numbers.

I think this happens on systems with nearby frequency options in xrandr, like 59.96 and 59.97. It looks like mutter gets confused when multiple similar frequencies are available.

This bug was fixed in the package mutter - 41.3-1ubuntu1

---------------
mutter (41.3-1ubuntu1) jammy; urgency=medium

  * Merge with debian, includes these upstream changes:
    - window: Don't change workspaces of unmanaged windows (LP: #1933996)
    - backend: Reset idletime when unplugging the power cable (LP: #1945121)
    - clutter/text: Invalidate actor paint volume when it has changed
      (LP: #1882291)
    - backends/native: Ensure pointer is onscreen in input thread (LP: #1933186)
    - OSK Enter, space and backspace keys don't work when typing in Greek
      (LP: #1820523)
    - window: Don't change workspaces of unmanaged windows (LP: #1932328)
  * Remainig changes with debian:
    - debian/gbp.conf: update upstream branch to point to ubuntu/master
    - debian/patches/x11-Add-support-for-fractional-scaling-using-Randr.patch:
      + X11: Add support for fractional scaling using Randr

mutter (41.3-1) unstable; urgency=medium

  * New upstream release:
    - Check keyboard serials for activation
    - Fix mixed up refresh rates in multi-monitor setups (LP: #1788535)
    - Allow disabling HW cursors
    - Improve damage handling (LP: #1872870)
    - Consider xrandr flags for advertised modes
    - Ensure constraints after client resize
    - window-group: Disable culling when rendinging clone to offscreen buffer
    - Fix workspace switch animation in default plugin
    - Fix unfullscreening of window that were mapped fullscreen
    - Fix DMA-BUF screencasts with unredirected fullscreen windows
    - Fix orientation changes on devices with 90°

mutter (41.2-2) unstable; urgency=medium

  * Team upload
  * d/p/Consistently-pass-timestamp-as-uint64-when-creating-MetaS.patch:
    Add proposed patch to fix FTBFS on 32-bit architectures
  * d/patches: Update to 41.2-6-g7b64c159a
    - Surface damage viewport improvements
  * Update patch metadata with upstream status

mutter (41.2-1) unstable; urgency=medium

  * Team upload

  [ Simon McVittie ]
  * New upstream release
  * d/patches: Drop patches that were applied upstream
  * d/patches: Update to upstream gnome-41 branch commit 41.2-3-g5d0c26631
    - wayland: Check keyboard serials for activation
    - Sync refresh rate to the correct monitor for maximized/full-screen
      apps in a multi-monitor layout
    - Add a debug environment variable to disable hardware cursors for
      faulty hardware and drivers

  [ Laurent Bigonville ]
  * debian/rules: Disable systemd support on non-linux architectures

mutter (41.1-1) unstable; urgency=medium

  * Team upload
  * New upstream release
  * Drop a patch that came from upstream
  * Update Lintian overrides
  * Replace patches for #995929 with the version that was applied upstream
  * Remove workaround for #994806
  * d/libmutter-9-0.symbols: Ignore removal of clutter_stage_capture_into.
    Nothing else in Debian references this symbol, except for forks of
    the mutter codebase.

mutter (41.0-5) unstable; urgency=medium

  * Team upload
  * Merge packaging from unstable
    - No changes relative to 41.0-4, except for the changelog
  * Close #995929 via changelog.
    The patches in 41.0-4 seem to have been successful.
  * Release to...