I don't know what's going on behind the scenes at Apple, but my Halide Camera app (by Lux) bought using a different App Store account stopped working when that

I don't know what's going on behind the scenes at Apple, but my Halide Camera app (by Lux) bought using a different App Store account stopped working when that account is logged out as well. (It's a different country's account, so merging purchases between accounts wouldn't work.) Halide's support attributed this to a recent change with how the App Store works.