I found a workaround for a bug which displays the minimap during cutscenes.
If SetCutsceneMode is called from a conversation window which overlays the minimap, the minimap continues to be displayed during the cutscene. This can be avoided by delaying SetCutsceneMode by (say) 0.1 seconds, so that the conversation ends before the cutscene begins.
This works in both 1.69 and EE.
I’ve made a note of this on the Lexicon.