“Too many” kinda sounds right to my ear because beans is plural, but the second logically seems right because its served by volume and is not ‘countable’ as ordinary (non-destroyed) beans might be.
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I am the higher authority.
This is a question of noun phrase agreement and diction. If you use the wrong word you create a disagreement error. Period. Maybe whatever poser dictionary you use has a new form of less or fewer but mine doesn’t.