Spall liners have been very buggy, even after many months of updates and patches. I believe spall liners should not be their own module but be a property added to the armor itself. This would allow small caliber ammo to pass through the armor, still reduce the spall but not completely evaporate the round. In many cases, stuff like that t90 and strv will be penetrated and the spall liner will just disappear. This should not happen
You can see in the video one shot destroys the spall liner but negates the round. The third shot also disappears in the already destroyed spall liner. This should not happen. What it should do is pass through the spall liner like it wasn’t there but have a reduction of spall entering the crew cabin.