Given the fact that liblipclua is part of the FW, and so is glib, an undefined symbol when loading this pains me, since, under normal circumstances, that would basically wreak the whole (default) UI.
What most likely happens is, KOReader already bundles a copy of glib, and that copy might be ABI incompatible with what liblipclua expects, and that this would be a new behaviour, stemming from FW 5.6.2.x.
Given my experience with 5.6.1.1 on my PW1, I'm not volunteering to move my PW2 to 5.6.2.x to check this out, so, good luck?

.