Vixen's Curse overlaps doesn't change damage past two with Awakened Spell Cascade

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What is the behaviour in-game?

When using Awakened Spell Cascade, PoB shows that 3 overlaps has no damage increase. However, testing in-game, I can tell my damage is significantly faster and higher than using normal Spell Cascade with just 2 overlaps.

What is the behaviour in Path of Building?

When trying to set overlaps to 3, the damage does not change at all. The damage remains the same at 2 overlaps.

How to reproduce the issue

Use my PoB link.
I did some testing and adding a custom field of 11% reduced Cooldown Recovery Rate seems to allow the third overlap, but my damage is the same as two overlaps.

I am not quite sure what is going on, but it seems the overlaps are hardcapped with a certain CDR? From various guides, and data on the internet on the build nobody has mentioned this being a thing. Not sure if it's a bug or if some other behavior is being applied behind the scenes.

Character build code

https://pobb.in/ndK__IKZoz6k

Screenshots

2 overlaps:

3 overlaps:

Start by loading the linked PoB build and reproducing Vixen's Curse with normal and Awakened Spell Cascade at two and three overlaps. Compare the resulting damage and cooldown behavior, including the reported custom 11% reduced Cooldown Recovery Rate case. Done means Path of Building reflects the in-game third-overlap damage correctly.