Good news - the main issue I had with 4.8 has been fixed internally and the fix will most likely be in 4.8.1 hotfix: Game crashes on start - Programming & Scripting - Epic Developer Community Forums
That thread is not by a staff member. On the official page (https://www.unrealengine.com/marketplace/marketplace-submission-guidelines) it still says that code assets will be accepted later. Personally, I’m fine with selling on Sellfy for now.