In quite a few designs I play with, the /g and the /j that play nicely with all other letters crash into each other. My options as I see them:
1. Allow the crash.
2. Modify base /g and/or base /j (most likely the latter).
3. Make a /g_j ligature.
4. Make a contextual alternate (most likely /j.short).
If it weren't for the word "logjam" this would almost never come up (although a million and a half people do live in Gwangju). The /q also occupies that right-side descender space, but accommodating a "qj" combination feels certainly low priority.
I most often elect option 4 if the crash looks unhappy. But I'm wondering if a misguided sense of what a /j should look like keeps forcing me into accommodations that other designers don't face.