Scold's Bridle is bugged with Mind over Matter (deals damage as mana taken not only spent by skills)

I have tested this in game, and it definitely does not happen - if it did it would keep looping , since Scold's Bridle does deal damage, and that is transferred partially to mana by MoM.

Mana lost to damage is not spent at all, and doesn't go anywhere near the code for Scold's, which is spcifically in paying for skills. We couldn't make it work the way you think it does without substantially refactoring the code.

I can't say for sure what effect would be causing you to take more damage than you expect to, but it definitely isn't Scold's triggering on anything other than mana spent on skills.