Warning about glomming

Using -DDEBUG, I see a warning about glomming from OccurAnal. Having read the relevant Note, the situation is exactly what's described here: since I'm using cross-module specializations, the specializer will generate rewrite rules that replace external references with local forward references. But the one thing the Note doesn't explicitly state is why this is reported as a warning. It sounds like OccurAnal is well equipped to fix this problem. So is glomming a sign of a problem or is it not? If I see that warning, does that point to a problem in how I use the GHC API, a problem in the code that I'm trying to compile, or neither?