EDIT: This was not the fault of Proton nor Black Ops 3. Please disregard this issue
Hello @nathansmeal, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/864#issuecomment-1951736046.
EDIT: This was not the fault of Proton nor Black Ops 3. Please disregard this issue