Sadly, it looks like the manga is really ending next issue at chapter 16 (translation is 4 chapters behind) https://twitter.com/uMeMi_M/status/1409316098349010946
It doesn't necessarily mean the manga is suddenly getting the axe. It's just the nature of these promotional adaptations to be just long enough to make people check out the original source.
Even if there's lots of LN left to cover it's still possible the manga adaptation was axed. Definitely getting a whiff of that familiar chopping block smell, myself
Chapter 11 is the last chapter of volume 2 (already published), and new chapters are still coming out, so there's at least one full volume after this. What you're smelling is probably just a good old end-of-volume cliffhanger.