So this is interesting.

Our version of Forgotten Realms that we run in our campaign is somewhat based off expanding official setting information. This is implied by official setting, but I expanded it a bit. (This is how Konsi tells it.)

Maglubiyet created goblins because he was bored with Toril and wanted some entertainment, originally creating them much in his own image. They were entertaining for a while, but when they started building communities and growing beyond his expectations he became fearful - his creation had something he wasn't prepared to face: Potential. He envisioned a future where they could grow powerful enough to threaten him, and in his paranoia, he decided to pull the plug.

The other gods, seeing the goblins grow and shape the world were intrigued by this, and began to create their own races to populate the world too, some out of curiosity, some out of a desire for power - the worship that Maglubiyet was receiving had been feeding him and helping him grow in strength. With so many mortals on Toril, intermingling and sharing experiences, it became impossible for Maglubiyet to simply "undo" his creation, to many other minds and souls shared memories and experiences of them, so he was left with a creation he feared, and could not control.

Maglubiyet cursed the goblin people, giving them every disadvantage he could think of - to prevent them from growing to reach their potential, and to protect himself from them. He made them stunted and ugly and mean, he made them paranoid and greedy, he did everything he could to make sure goblins would not band together and explore their potential, and that nobody else would like them.

In doing this, he cut them off from the other gods, claiming all of their souls and worship for himself - he then made priests to spread his teaching, that all other gods were false, and that only he was worthy of worship, the priests taught goblins behaviours and rules that served to keep them from ever attaining anything beyond their meager survival - and in return, the priests were promised a slightly better lot in their afterlife. Not a good lot, just not as bad as the others.

In FR it's canon that "goblins only worship Maglubiyet" - in our game, if a goblin were to pray to another god, they'd be ignored, gods other than Maglubiyet actively ignore the lives and prayers of goblins... basically they're "not worth the effort". Tymora's attention to Konsi is the start of something new, a change to that status-quo.

So... it's legitimately possible that Sune was not aware of this specific romance without having it drawn to her attention directly. Tymora wants the other gods (at least the ones she likes) to get on her bandwagon, and "oh my goblin is doing a thing that another god would approve of" is a good opportunity to do that.