The request is about nether portal search, and preventing players entering the roof in a better way for old servers.

[akosovari]

Is your feature request related to a problem?

This would be a more pleasent way, to prevent players entering the nether roof on servers, where nether roof where enabled back in time.

Describe the solution you'd like.

The request is about nether portal search, and generating a new portal if, an existing found above the max Y height (aka abow roof).

it could be an option like

max-nether-portal-search-height:

or it might would be even better if the server doesn't even search for a portal in the nether above a given height

Describe alternatives you've considered.

The void damage is a great way (actually I would use both), but on a server where, there are existing portals, it's like a gambling, if you got yourself on the roof, well thats annoying.

Other

No response

[Owen1212055]

I really feel that this could be easily achieved with something like a plugin.

[BigCrazyOfficial]

This could be achieved more easily by making portals above this limit invalid locations for entering the nether. ~~which I just made a PR for hey isn't that convenient~~

[Machine-Maker]

I don't think this is a concern anymore. You will not travel to or create portals above the bedrock roof if the void damage is enabled, even if the portal existed before that option was enabled.