This error happens with master f77de678d89fe9e279cbb4228959955f42b007d3 2.93, 2.83.

Run the following script: blender --factory-startup -P leak_memory.py

import bpy
bpy.ops.object.editmode_toggle()
ob = bpy.context.active_object
bpy.context.scene.collection.children[0].objects.unlink(ob)
bpy.data.objects.remove(ob)
bpy.ops.wm.quit_blender()

Blender exists with:

Error: Not freed memory blocks: 24, total unfreed memory 0.489273 MB

Unlinking the mesh from the outliner while in edit-mode also leaks memory.