Uber Shaper inconsistent bullet hell

According to https://poedb.tw/us/The_Shaper#TheShaperTheShaperBoss, Uber Shaper is supposed to fire 6 bullet hell projectiles in P1, 7 in P2 and 8 in P3. Normal Shaper is supposed to fire 12 bullet hell projectiles. However, Uber Shaper can randomly decide to fire 12 projectiles (over ~15 fights, I have not found any consistency about when this issue can occur - I've had fights with 6 - 7 - 8, fights with 12 - 12 - 12, 6 - 12 - 8, etc.)

EDIT: After taking a more detailed look at the shaper's abilities on poedb.tw for both uber and normal versions, it seems that he has both AtlasBulletHellUberPhaseX abilities AND the normal mode one AtlasBulletHell as his uber bullet hell abilities, so AtlasBulletHell probably replaces an AtlasBulletHellUberPhaseX at random. Is that intended?

Screenshots showing the issue in action (both were taken during the same Uber Shaper fight):