It is compatible according to them though:
“Adobe has tested the latest versions of Adobe Creative Cloud applications for reliability, performance, and user experience when installed on Intel-based systems running macOS 10.14 Mojave. The latest versions of all Creative Cloud products are compatible.”
Sorry! Strange things can happen when the OS is updated before the latest version of Premiere Pro comes out. I recommend on waiting to use the upcoming version with any new OS, not the current version. Though you have may have this announcement, there are bound to be some kind of unexpected behavior when jumping the gun on updating your OS so early. If you're OK with being a groundbreaker with possible issues intact, go ahead. If you prefer a more stable environment for your new OS, don't install it until a new version of your software is ready. That's pretty much how it's been since I've been editing, and that's a lot of years!