1st Transcendent Spirit still working questionably
I read through issues #1881 (closed) and #2799 (closed) and while it is considered official behavior, it is my belief that this should be changed. 1st TS is an already underutilized and underestimated skill, and to keep such awful interactions can, in some instances, make the skill completely unusable.
I read there was supposed to be a fix for some part of it on a patch, but I read through the changelongs and couldn't find anything.
I suggest to change the skill, in such a way it works similarly to Marionette Control. It takes the stats of the target when cast and applies the bonuses accordingly, if the target is already buffed, tough luck, will have to wait the next cycle. It would also mean the bonuses wouldn't refresh themselves upon a level up. However I consider these downsides to be better than completely losing the soul link.
Or, alternatively, fix the skill so it doesn't go away when buffed.