adding following patch to the package 
--- mesa-26.0.8.orig/src/egl/drivers/dri2/platform_drm.c
+++ mesa-26.0.8/src/egl/drivers/dri2/platform_drm.c
@@ -234,6 +234,10 @@ destroy_oldest_unused_bo(struct dri2_egl
          max_age = dri2_surf->color_buffers[i].age;
       }
    }
+   if (!oldest_buffer) {
+         _eglLog(_EGL_WARNING, "No oldest buffer");
+       return;
+   }

triggered the log
Jun 26 00:20:59 ubuntu gnome-shell[106454]: libEGL warning: No oldest buffer

so this is a problem

I have reported it upstream which looks to be affected on main branch too.
https://gitlab.freedesktop.org/mesa/mesa/-/work_items/15735

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https://bugs.launchpad.net/bugs/2152207

Title:
  Failed to lock front buffer on /dev/dri/card1:
  gbm_surface_lock_front_buffer failed | Failed to query buffer age, got
  error 3003

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