Hello!
From what I have seen, it is a common problem in certain cases of dynamic lighting.
You can fix it by increasing the “Shadow Bias” in your dynamic light propierties:
- In the details of you light, in “Light” category expand “Advanced”
- There increase the “Shadow Bias” to 0.6
As the documentation says:
“Shadow bias is a per-light set of properties that help improve accuracy of self-shadowing and contact hardening from a light source.”
If you want to read more I leave you the link to the documentation about Shadow Bias:
And here is a link to another user with the same issue too, in case you would also like to try some of the other solutions offered by users:
I hope this helps you!