Soil erosion under back deck

Recently, we noticed the original plumber who did all the plumbing in our new house did not extend our sump pump outtake pipe away from our foundation. It was at most 4 feet away from the foundation. The outtake pipe is under our back deck. Therefore, a few days last week when the snow melted and we had a lot of unthawing, the sump pump kicked in. This created a lot of water from sump outtake pipe to just pool under our deck against our foundation and recycle into our pump. It didn't cause any water to go in the basement, thankfully, and has since dried up. The issue was corrected after a few days last week of pump running when I started questioning why it was running so much as it hardly ever turns on and the pipe has now been extended at least 10 feet away from the foundation.

The issue now though is all that water from the outtake pipe created soil erosion and a fairly large trench right against a part of my foundation that is under the deck. My best guess is probably 8-12 inches of soil lost right where the water was pooling. We are planning on actually removing the deck and doing a garage add on where the erosion currently is. My question is, do I need to contact a contractor and/or immediately try to refill the parts where the erosion happened? Or can we leave it until our garage gets built (hopefully start of summer)? I am just concerned about the impact this erosion could be now having on my foundation but don't know enough about it to make an educated guess. It's not along a large portion of the foundation, maybe 7 feet.

I added a picture for context. You may have to turn your phone 90 degrees as it uploaded at the wrong angle for some reason.