This mod makes more clearly understandable behavior for undead immunities and allows the Undead Bloodline to cause Confused, Frightened and Compulsion effects. The Undead Immunities bar now only lists Mind-Affecting, Sleep and Stun as Mind-Affecting immunities. The Undead Bloodline does not ignore the stun or sleep immunity. Those spells do not effect the undead. This better matches tabletop behavior. A more detailed description is given below.

This mod requires Unity Mod Manager:
To Install the mod, first install UMM from here:
https://www.nexusmods.com/site/mods/21?tab=files
Then run it and connect it to your Install folder
Then drag the zip file from this mod into the UMM installer window

As laid out here:

https://www.d20pfsrd.com/bestiary/rules-for-monsters/Creature-types/#TOC-Undead

The undead trait should grant immunity to mind-affecting effects,
Then specific immunities to bleed, disease, paralysis, poison, sleep, stunning, fatigued, exhausted and Fortitude save based conditions.

The base game grants them the immunities in two waves. They are

Wave 1
Poison, Disease, Sickened, Shaken, Fatigue, Frightened, Exhausted, Confusion, Death, Bleed, Bleed from special source
Wave 2
Mind-Affecting, Fear, Compulsion, Emotion, Charm, Daze, Shaken, Frightened, Confusion, Sleep

What shows on their stat block is immunity to
Poison, Disease, Sickened, Shaken, Fatigue, Frightened, Exhausted, Confusion, Death, Bleed, Mind-Affecting, Fear, Compulsion, Emotion, Charm, Daze, Sleep

That all mostly makes sense since the extra immunities track with effects that are generally Fortitude save negates in pen and paper.

The big issue comes from the Undead Bloodline for Sorcerers. Their bloodline arcana states that it allows them to ignore the mind-affecting immunity of undead creatures. However, its implementation is to ignore the second wave of immunities. This creates issues where the undead creatures remain immune to Confusion and Frightened conditions but are still prone to Sleep, specific compulsions like Hideous Laughter and Feeblemind, and Dazes. Its unclear entirely which effects will work or not until you try them specifically.

I found it quite frustrating. For clarity and closer to tabletop implementation I have changed the two immunity lists to the following.

Wave 1
Poison, Disease, Fatigue, Exhausted, Death, Bleed, Sickened, Stun, Sleep
Wave 2
Mind-Affecting

To match the PnP immunity to Fortitude Negates effects this mod also adds Baleful Polymorph effect immunity.

Many daze effects use the Daze cantrip spell as a basis for their effect and are therefore implemented as Mind-Affecting. Undead Bloodline, and any modded abilities that copy that feature, still use base game functionality of ignoring the Wave 2 of immunities. This allows those characters to daze appropriate monsters. A few spells, like Slowing Mud do not use Daze as their basis and therefore function fully as they should.

To allow Halt Undead, one of my favorite spells from the Call of the Wild mod, to function fully I did not implement the paralyze immunity.

Update:
Starting with version 1.02 this mod will now also be the place where I upload other fixes for small bugs I encounter. Thanks to the amazing Call of the Wild Mod and its author, Holic92, for helping me understand this issue. This mod is currently, and will likely remain, largely redundant with that mod which has implemented its own version of undead immunities. The next update of that mod should fix the Alchemist Cognatogen issue as well. I will continue to maintain this mod anyway because it is much smaller in scope.

Call of the Wild:
https://www.nexusmods.com/pathfinderkingmaker/mods/176

Wisdom Cognatogen had a duration of 0 seconds. This mod should now correctly set that ability's duration to the appropriate 10 min/level.