[Autumn]

Misty Dimension doesn't apply sneak to you from Auto-summon (the GS one), afaik Auto-summon does trigger almost all summon related passives and does cost FP so I think this should apply, I only noticed this now cause I didn't receive camouflage.

[Autumn]

I should also mention that Split Form doesn't apply the Sneak Status from Misty Dimension either, this is my main form of summoning currently and I am not sure if it should apply, I can at least tell you that Split Form applies Impact Call (likewise, meld form applies impact dismissal), so I presume that it might apply to it. Either way I thought I might mention that.

The FP Cost of Split Form isn't increased by Misty Dimension, nor is it reduced by New Heights either