Track Count = 1 from addressables on build

This question (or a variation on it) has come up quite a bit recently.

This thread has a similar issue and solved it by having a Timeline in the base executable with the track types getting stripped.
My comment on this other thread has some hints on how to diagnose this.

If neither of these help, then feel free to give us more info on your situation.

 

So, it seems I have been misinformed.
These diagnostic folder require a non-release build

Also, from your deleted comment:

"Another weird behaviour is that sometimes when I build my game for WebGL the addressables timeline works... and when I close unity and build again the error returns, it's occurs in 30% of builds."

That seems extremely weird to me. If it was a stripping issue, I would expect it to always be the same. Maybe try to see what changes between builds.

At this point, I have reached the limit of my (theoric) knowledge on code stripping, and if you want further help, I will need a reproduction project to be able to help you.

 

It is not accessible outside Unity or source code builds of Unity, sadly.

 

This looks correct as far as I understand it. Actually, from my understanding, just the attribute should be enough.

If that doesn't fix it, I would look for compilation errors, exceptions, etc happening during the build process or during loading.

 

That's great.
Could you please also file a bug report using the bug reporter?
You can attach the rar files to it, give a general description of how to reproduce this.
You can also reference this thread in your bug description.

You will get a bug number, which you can paste here too.

This will ensure proper tracking, give you something to monitor, and make sure it doesn't get lost if I get hit by a bus.