Generally speaking, if the whole model flickers, the probability is that the model has overlapped faces or the glass model is single-sided; If it is streaked flicker, it is because the glass model is single-sided, or the coordinates of the glass model are too far from the coordinate origin (we can select the model in the resources list and reset the model coordinates to 0,0,0 in Inspector). Please also check the model and coordinates in the modelling software.