Hi Jack,
Will you please upload a screenshot of the simulation if possible? There might be possibilities of stress singularity, but it can’t always be there because it can depend upon the nature of the applied force, Boundary condition and contact on the corner as well. If the very high stress is very much pointed on a small region as compared to the whole area, then we can think about the stress singularity, but I would be in a better position to comment further if you could upload a screenshot of the simulation and what types of loads you have applied.
Regards,
Sampat
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