So. For everyone who is curious.
I searched a bit online and plugins not showing up in the logic list seems to be a specific logic bug with unknown reason.
(seems to have also happened to some people with big brand plugins like native instruments)

The solution that seems to work for most people (including myself) is deleting (if they exist, doesn't need to be all of them):

user/Library/Preferences/com.apple.audio.AUHpostingService.x86-64.plist

user/Library/Preferences/com.apple.audio.InfoHelper

user/Library/Caches/AudioUnitCache

user/Library/Caches/com.apple.audio.AUHostingService.x86-64

user/Library/Caches/com.apple.audio.InfoHelper

@David-Healey I just forgot the stage of setting the permissions with your provided code "chmod -R 755" before packaging

@VorosMusic Looks quite good.
I guess I will do the same for now and work within the limitations.

@ustk
That's true...
Even though its not the same Sampler you might be correct. As far as I know there is an AllNotesOff event, when changing Samplers Bypass.
But I already tried a different order, it did not make a difference.

I think I also tried delaying the PlayNote once, but did not work as well and lately I tried a different sample and it played, so it seems to be a quite specific issue.

I'll try to rebounce the sample I'm using, maybe that fixes things.

@ustk
Good Call!

Turning off custom graphics (unintuitively) fixed my main issue.
Now your mentioned problem comes into play not getting my image names correctly, but I should be able to fix that.

Tank you!

@d-healey Oh I see! I thought this was for an additional custom location that has nothing to do with the main sample location, I lost myself overthinking...

@d-healey @Christoph-Hart
ok, than I'll do it that way!
Thanks!

@d-healey Thank you!!

@d-healey
Perfect, thank you!

@d-healey You're absolutely right, Dave, and if I give this possibility, I don't rely on it myself...

@VorosMusic

I have buttons on the UI to switch between different Instruments/Samples

There are multiple methods to do that, so it would depend on what you're doing.

@VorosMusic Oh !!

@d-healey
Oh thanks, didn't even think about that!

@d-healey
I see, where I was wrong...
I needed to set them to false and not delete them...LOL

@ulrik Thanks for the suggestion.

I would be very grateful if you could share a basic snippet on this, I really don't know what to do, broadcaster stuff can get really complicated.

Its a bit much to take in debugging the first time.
I found an assertion failure for jlimit in MathsFunctions (lower value is bigger than the higher value).
But I still try to figure out where this jlimit belongs to.

@iamlamprey Thank you for your help!
I don't know why. I redid some other elements of my code and suddenly it worked.
So yes for now its working properly in Hise itself.

@d-healey Thank you!!
I think you are right. I remember you mentioning something like that.
It seems to work now!