I managed to squeeze five levels of maps out of my example, going to 4 levels of offset (offset of offset of offset of offset).

All of the offsets are correctly made, relative to their parent maps.

However the line created by point map-connection is only correctly originating from its parent map at the most deeply nested level of offset and at the 1^st level offset.  At all other offset levels, the map-connection line reverts to originating from the top-level map, and not from its direct parent.

In the marked up diagram below:

• #1, #2 indicates the offset level
• The squares indicate the scope of the various maps subordinate to the main map
• The extreme left (green) and right (yellow- almost) map-connection lines correctly originate from their parent maps
• The map-connection lines highlighted pink and blue originate from the main map, and not from their parent map, even though the offset is correctly made from the parent.  The recti-linear lines I have sketched show where I expect the map-connection lines to be drawn.

For comparison https://therion.speleo.sk/wiki/mapconnectors?s[]=connection describes offsets 2 levels deep, and as I have found and on that wiki page, 2 levels deep behaves as it should.  It is only once we get to 3 levels of offset that the behaviour deviates and becomes problematic.

So the pattern is clearer, and I am becoming more confident it is a bug.

Why a bug? 

• Because at 2 levels of offset the effective behaviour is that each map-connection line originates from its direct parent.
• And at 3 and 4 levels of offset, the effective behaviour is that the only the most deeply nested and the 1^st level of offset map-connections originate from their direct parent.  The intermediary level offset map-connections originate from the main map location and not from their direct parent.

So maybe it is a problem with the definition of point map-connection, or the way that the origin and destination locations are parsed to the map-connection lines?

Bruce