It can happen
Rats who know how to chew will teach other so any rats that are in a chewed up tub must be culled.
As to prevent chewing make sure there is no grove or gap allowing rats to get started, make sure they have a good food source and water and provide a piece of wood in their tubs.
All of mine are provided with a piece of 2 x 4 and there is no chewing.
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