Infested Pets does not increase Mastery rank progress.

[Shinjukunoyopparai]

Also, Necramechs does not show at vehicles section even though they increases MR progress.

[Unimira]

Can confirm that the new infested companions do not increase mastery, even after gilding and they showing up as Mastered in Profile

[L2Alpha]

Same for me....hope they fix it quickly, cause thats really killing my motivation to interact with the whole conservation system on deimos 😞 At least the new guns and blades work normally 

[Liam]

Yeah can confrim too, modular companions from Heart of Deimos does not give MR fodder, and just did all of them. 

[Kamachi]

Can confirm. All 6 maxed, gilded and then maxed again. Show as mastered within my profile yet yielded no Mastery increase.

[JuniorecK]

Same here

[minininja77]

Glad its not just me, 4 pets no MR points from any of them