Why doesn't convolution bloom work with Sun/Sky?

Why doesn’t convolution bloom work with Sun/Sky? Normal direction works fine with convolution bloom in post processing volume. If I put the sun/sky blueprint in it all washes out. Exposure settings don’t help.

Just worked out if you set direction light to 10 lux it works! Wondering why it set to 75000 lux as default? This is correct for the sun, but doesn’t work with convolution bloom?