Automatic Effects like Magic Resistance 5e (Legacy)

[Yawgmath]

Hi,

I'm a DM of a legacy campaign and want to use some Archmages with Magic Resistance. I dragged them to the combat tracker but there was no automatic effect on this NPC. I assumed, that I couldn't see the effect and tested some saving throws against the NPC, but there was no advantages rolls. Then I added the effect 'Magic Resistance' by hand but still no advantages rolls. After this I changed to an other NPC with Magic Resistance - still no advantage rolls.
Then I tested the same with Gnome Cunning but still no advantage rolls.

Can someone tell me, why this effect isn't working anymore? Is it a result of the changes like the inverted logic to IF and IFT since last month? How can I get an effect like Magic Resistance or Gnome Cunning in this Version from now on?

Greetings,
-Yawgmath

P.S.: Is there any reason why I can't use effects like ATK: [PRF] or ATK: [LVL] or ATK: [-INT] or etc.?

[Zacchaeus]

This is working for me both for NPCs and PCs with the Magic Resistance effect. Are you using any extensions? Can you replicate in a new campaign without extensions?

[Zacchaeus]

As regards your PS this is also working for me. So again it could be an extension if it's not working for you.