Playing in Project Ozone 2, it seems when I put a Special Efficiency Dimlet(Rarity:5) it makes the world more expensive on every aspect. This is when trying to create a Dimensional Shard Ore world.

Without the Efficiency Dimlet the cost says
Creation: 2,065,020 RF/t
Maintain: 1,880,102 RF/t
Tick Cost: 3,920 ticks

With the Efficiency Dimlet the cost says
Creation: 2,067,020 RF/t
Maintain: 7,227,734 RF/t
Tick Cost: 4,820 ticks

Material Dimensional Shard ore Dimlet
Liquid Default Dimlet
Terrain Flat Dimlet
Controller Single Dimlet
Biom Plains Dimlet
Sky Normal Dimlet
Sky Normal Day Dimlet
Sky Normal Night Dimlet
Sky Normal Fog Dimlet
Sky Normal Clouds Dimlet
Sky Body None Dimlet
Mob Default Dimlet
Effect None Dimlet
Feature None Dimlet
Structure None Dimlet
Time Noon Dimlet
Special Efficiency Dimlet

With Dimlet

Without Dimlet

If I switch the Material Dimlet for Block of Diamond it reduces the Maintenance cost correctly it seems. I tried looking through the books and Google for anything on Dimensional Shard Ore not working with or intentionally increasing the cost instead as like a punishment for trying to get the own mods main ore in bulk but couldn't find anything.

Edit: Same order, but switching out the Rarity:5 Efficiency for the Rarity:4 seems to have lowered the cost . However, trying to add them both doesn't change anything further. It is also a Rarity:5 Efficiency dimlet I made through the Workbench if that makes a difference.