Thanks. I don’t remember who sits where, but the smallest one is the Mars Pro.
Does the hole go vertically all the way through the part in that location? If not, then it’s possible that it was caused by crud (i.e., large particles) in the resin.
While this next step shouldn’t be necessary, remember that if you’re using community resin the last person may not have been adequately diligent about resin hygiene - or for that matter may not even know that they created lost particles. Frequently I filter the resin when I pour it into the vat, just in case.
If the hole goes all the way through, is the hole perfectly rectangular/square (as projected onto the angled face)? If so, it’s possible that part of the LCD array has burned out.