Not trying to be a jerk, and admitting it might not be a problem, but the mechanism that I'm thinking about is that the lanolin oil separates out of the thicker carrier and oozes/creeps out of the threads and onto the
outside-face of the insert. If it gets to/inside the external yoke o-ring, it would be in the gas path. Not a pressure thing - more of a handling issue.
A tank sitting in the hot sun is going to get pretty warm and help to thin things out.
I keep my grease-guns in a plastic tray because a lot of greases separate out and the more liquid components get everywhere! Anti-seizes separate in the jar. I couldn't find any detail on the composition beyond containing lanolin so I admit I Ass_U_Me certain things.
Just musing .... Engineers' Disease - dissect everything to see how how they work/fail.