Canopy of Su27/J11 don´t pop off when opened and ejecting on the ground

[Skyhammer]

I noticed that the SU-27/J11's canopy does not fly away from the aircraft when ejected on the ground and when open. This problem seems to affect only the flankers because I've also tested it on the Mig 29A/S/G and the canopy snaps off when you stand on the ground and opened

Im using version 2.8.3.38090 MT