The DrawDebugString() function has to versions. One is the actual function to display a string of debug text in non-Shipping builds, and the other is an empty function that is used in Shipping builds. However, the signature for each of these versions of the function is different. The normal function takes 8 parameters, but the empty Shipping version of the function only takes 7 parameters. This will result in a Shipping build failing if this function is called with 8 parameters (and it is not guarded by something like #if !UE_BUILD_SHIPPING).
No. The same behavior occurs in 4.20.3.
The Shipping build fails with an error stating that DrawDebugString() does not take 8 parameters.
The Shipping build completes successfully.
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-71998 in the post.