Many osu! players have reported about these issues. The last working version is 22.5.2
Before 22.11.2 it would cause game crash or BSOD sometimes. Even on the latest as of now (22.11.2) OpenGL exclusive fullscreen still doesn't always work and the flicker issue is also still there.
Dear Devs, in order not to force you to read the links above, I will write briefly: randomly after starting the game (osu or minecraft), the exclusive fullscreen may work correctly, or it may have vsync from dwm (like borderless window). if after start the exclusive fullscreen mode works fine, it can be broken with repeated fast switching between windowed and full-screen modes (F11 in minecraft or alt+enter in osu) or alt+tabs (only osu).
replacing atioglxx.dll in 22.11.2 from 22.6.1 fixes the issue but removes all performance improvements introduced in 22.7.1