Heyo! Could you please make sure you add this to the bugs thread and we will ensure to report this.
We identified an issue with this feature a little while ago. We are hoping to get it resolved and reinstated in the next sound update which will be in early 2020.
We included an update this patch to the reticule: "The gun sight reticule has been switched to utilize new technology, which opens the doorway to future changes in the game. Its visuals now look neater and cleaner". When I tested elements this morning my reticule worked fine, if you could please provide more details on what is going on with your reticule and which one you are using I can investigate for you.