Suddenly, in 4.25.3, my navmesh keeps drawing while in PIE resulting in a huge loss of FPS. Does not affect standalone. Unchecking navmesh drawing does not save. It will revert back to checked with the yellow arrow next to it. (even though its the default setting).
Basically game is running at 11FPS in PIE, and 100FPS in Standalone. Workaround is to uncheck navmesh drawing while running PIE for it to go back to normal 60-70FPS.
Problem still occurs in 4.26.