Crash reports in 31a show that the server is non-integrated when its clearly not

Note that although I technically can't show you a crash report from me at the moment ^{(computer currently being repaired)}, I have an example from a 30c crash, and a 31a crash.

What "I" expected to happen was for the crash report to show something like this:

From MC-64076

Server brand: vanilla
Server type: Integrated singleplayer server

What actually happened was that a crash report showed something like this:

From MC-64024

Server brand: vanilla
Server type: Non-integrated multiplayer server

Steps To Reproduce:

1. Start a server using the 31a jar
2. Connect to the server
3. Manually perform a force crash by holding down F3+C or FN+F3+C for 10 seconds while on said server.