Then, when I removed them as I was done with models, the ceilings began to have light issues (SAME texture as columns and walls), appeared some occlusion issues too on some rocks (both 2nd pic), and the landscape went buggy with light too (3rd pic)
@Echu it would be interesting if you can do the steps i found to be breaking up my light system, i submited some bugs about 4.21 and 4.22 giving me the same kind of problems.