gain the boundary doesn't exist anymore and has zero priority. Fixed anyway, the issue was the old boundary being geometrically incompatible with the current correct one.

There is and was a real issue with the lake itself in that part of the water area was tagged (not glued) on the admin boundaries, I've redrawn that as a fix for the municipalities for which we've fixed the admin boundaries of, but it is a latent problem for Neuchâtel itself.

Postal code boundaries are not useful in Switzerland and in general we have not mapped them. Breakage of this specific one was not unexpected as the surrounding municipality were very broken (high priority to fix) and I haven't arranged a current source for it yet.

Neither boundary actually exists anymore since many years and should simply be deleted, or at least the misleading tags removed.

Again a typo this was actually work on Mettembert.

You are jumping to conclusions.

Yes, the person doing the import added a small number of (unnamed) peaks at the time. This is weird as we had no such data and the dataset didn't include it (the relevant POI/peak data from swisstopo wasn't open data back then). Some of these peaks were later edited and relocated.

The rest were added much later, without reference to topology or the border, and the simple explanation, applying Occam’s razor, of why they were joined to border is accidental gluing.

Yes this was on purpose, as ungluing from all other non-border elements (for obvious reasons)..

The border was originally imported from swisstopo (the same source as from where we are updating it now) with no reference to peaks etc.

While legally, as in the contract between IT and CH, it might be defined with reference to peaks we would need for the peaks to be at the location used when that happened. In any case it is clear that the current location of the peaks in OSM doesn't directly define the border so it doesn't make sense to include them.

Leimbach naturally.

Because the relevant tags were empty.

Genau, und deshalb hat es nichts mit den administrativen Grenzen zu tun.

Nochmals: ob Wasserflächen zu dem Gemeindegebiet dazu gehört oder nicht wird vom jeweiligen Kanton bestimmt. Aktuell ist es so, dass im Kanton Thurgau sie nicht dazu gehören. Wie man auch leicht and den Nachbargemeinden sieht, daran halten sich sowohl die swisstopo wie auch das BfS, und auch wir.

PS: der Zonenplan ist von 2019.

Das offensichtliche Problem, dass du auf eine Quelle verweist dass du im Changeset nicht angegeben hast, mal ausser Acht gelassen: du kannst dich gerne mit swisstopo, das BfS und den Kanton Thurgau streiten., aber aktuell sind die alle der Meinung, dass du nicht recht hast.

Dieses Changeset vermischt viel zu viel verschiedene Sachen speziell wenn du gleichzeitig an Grenzen arbeitest (wie dir auch schon gesagt worden ist), und macht es schwierig genau nachzuvollziehen was du geändert hast.

So oder so, du hast die Grenzen von Gottlieben verschlimmbessert, der Rheinanteil gehört nicht zur Gemeinde, die Grenze verläuft am Ufer entlang (wie du leicht aus den verwendeten Daten von swisstopo sehen kannst).