A trick I’ve seen to deal with this is to get two litter pans that are identical. Drill a couple holes in the side of one, and use a cable tie to anchor it to the pen wall in the corner you want it in. Then put the other litter pan inside and set it up as you normally would.
I also recently started using dish bussing trays as litter pans. They are super thick plastic and my buns have been less inclined to chew on the edges (and they are heavy so harder to toss around).
Last tip, Bun Jovi went through a phase of doing this a couple years ago. I started giving him organic palm plates to chew instead and it helped a ton. I also would clamp some strips of cardboard to the edge of the litter box so he would chew that instead of the plastic.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.