When you have Dante's Word Warden (light + dark verse) active, using Cedo's alt-fire will cause the book to shoot even if there are no enemies. The only requirement is that the Cedo's glaives hit something, be it the floor, a wall, etc. (the normal mode of the Cedo does not trigger this bug, just the alt-fire)
And shooting the Cedo's glaives at certain angles will cause the Word Warden's shots to orbit around your warframe indefinitely until they come in contact with a physical object like a wall or enemy. The orbiting shots also seem to stack indefinitely, but because it stacks so slowly I don't think there's a chance of it becoming a performance issue unless someone is willing to just stand there for like an hour recasting Word Warden and spamming the alt-fire button (though it does become a visual and audio eyesore after a few shots).
The blue streaks in the screenshot are the result of stacking like 20 of the word warden shots from the bugged interaction. As you can see, the shots don't seek out enemies or anything, they just orbit around the frame until they come into contact with an object.
Title. In the modding screen, Eclipse's ability card in the modding screen is still showing pre-nerf values. Below is an example of Eclipse on Nezha. The bugged values are purely visual and only exist in the modding screen. Hovering over the ability in the arsenal screen and actually casting the ability shows the corrected values.