Screen flickering only on MacOS

Hi, I have a 2015 13 inch Retina MacBook Pro that has a display issue, when booted to macOS (I tried several macOS versions), the display just flickers continuously. Sometimes it's just flickering, other times the display would show corruptions, but:
- The display does not flicker in recovery mode, or in Safe Boot
- The display does not flicker in any other OS like Windows 10, Windows 11, and Ubuntu Linux
- The display stops flickering on macOS the moment I connect to an external display
- The flickering does not change/improve when adjusting the lid angle

In the other OS scenarios I just described or when I use macOS with an external display, the display works PERFECTLY. No flickering, no hanging, brightness control works, it's just in macOS proper it starts acting broken, even went as far as to use it daily on Windows 11 and yeah, the display works perfectly.

Things that I have tried:
- PRAM/NVRAM reset
- SMC reset
- Cleaning the connector on both the screen and motherboard
- Different power adapter
- Different macOS versions (tried El Capitan, Catalina, and Monterey)

Note: the device has no battery. It runs from adapter only.