comparing two columns leads to always True

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Version: tinydb==4.8.2

Here's the database:

{"_default": {"1": {"name": "bob", "age": 25, "belly": "blown"}, "2": {"name": "dylan", "age": 26, "belly": "flat"}, "3": {"name": "inflated", "age": 27, "belly": "inflated"}}}

Here's the code:
db.update({'name': 'cooper'}, Query().belly == Query().name)
or
db.update({'name': 'cooper'}, Query()['belly'] == Query().['name'])

Expected result : only the last entry should have its name updated (because both "belly" and "name" are "inflated")

Actual result : all entries have their names updated