We're on the same page, because my goal when writing these messages is to increase awareness about route continuity.

There are three basic types of discontinuities in route relations, which prevent routing apps and altitude profiles from working correctly and that trigger warnings in QA tools:
- holes, that correspond to missing ways in the relation. I fixed a tiny hole at a crossroads where two ways were not connected at the right node.
- "barbs", where a way goes beyond its connection to the next way. There was none here.
- members that are not in the right order, each way being connected to the next in the list. I reordered the list of members.

These issues are not always detected (to say the least) by JOSM and iD. But the QA tool Knooppuntnet Monitor does it: https://knooppuntnet.nl/fr/monitor/groups/fr-nwn/routes/GR%2049/map?mode=osm-segments&reference=false&matches=true&deviations=true&osm-relation=true&layers=background&position=43.61196556,6.60532190,10

