Playback not working in source monitor after selecting mark in point

Hello, i have a huge bug in Premiere Pro beta, when I try to select my media from source, I hit play it works and then when I put a mark in point of a certain part of the video playback is not working anymore in source monitor but if I drag it in timeline it works. The app is updated, I tried restarting the app, restarting the laptop but the issue is still there and it's a huge draw back in my working flow. What can I do?