It broke. I can see the telltale tip.
The corner should not have been left as a sharp inside corner.
Both Plexi and Lexan are notch sensitive, Lexan less so, so sharp corners like that can be trouble and cause breakage.
A good radius such as from a hole saw and then some sanding to smooth the cut may have prevented the break.
Even just a small support backup block at the corner may have prevented the break.
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