[ANSWERED] Line/Trail Renderer width curve inspector problems.

So, I've been having problems with Line- & Trail Renderer width curves for a while now, at least from Unity version 2019.2.0 . I can't seem to add keys to the curve in the inspector by Right Click --> Add Key, the same is true for deleting keys. I can however add keys by double left clicking the curve & delete by pressing the delete key. Sometimes the console outputs error messages regarding the attempted key addition.

Here's the issue...


...and here's the errors


Here's what I've tried doing:

I tried to search online for the same issue without success.
I tried re-installing the problematic Unity versions.
I tried reproducing the issue on different versions of Unity.
All versions(that i have installed) before 2019.2.0 didn't have the issue.
I made new clean projects for each tested versions too.

So does anyone know why this could be happening?

 

Ah, i must've missed that one while i was looking through entries in the Issue Tracker.

Thanks for the info, that cleared up why it wasn't working.