Sorry, I don't get what you mean.
First of all, it's sad but normal that you probably can't restore your old maps - I update the generator, the algorithm changes, the same parameters produce a different result now. I mean I understand the inconvenience, but there is no way around for a an app that is still under development.
Second, this particular generator works with permalinks... weirdly. It doesn't update/remove unknown parameters, it just ignores them. That "162328916=1623289160" doesn't have any effect, but stays there for any new map. I guess I should fix it. The actual permalink is this:
https://watabou.github.io/neighbourhood/?tags=leafy%2Csecular%2Clarge%2Carea&see...