Look at this screenshot:
All OSM buildings and roads look like that for me - I mean that blue tone. It is some shader error because it is not visible from close up, it starts to be noticeable about 1000 to 2000 feet away from them. In the center there is one building that is weirdly not affected.
I'm using AppImage 2020.4.0 from late summer 2021, but I already noticed this on the first version that supported OSM buildings ( 2020.3.8 ).
I have a nVidia GeForce 520 GPU with 1 GB VRAM and the 390 proprietary drivers, but this bug is also present when using an opensource driver (Nouveau).