Currently, if on a server, someone happens to have a base in the overworld at the coordinates where a runed portal in the end coincides, the portal will generate right inside their base when activated and destroy whatever they have there.

Would be good if there is some way to make them respect the claims from FTBchunks and place in the nearest available location. They should also probably look for a clear spot similar to nether portals rather than just plopping down in the exact location.

Might be cool to generate a small sky island where the portal gets placed. Would fit the theme i think.

Thats is something that should be requested also on the Fabric side

done, tho ftb chunks isnt ported to fabric quite yet, should be soon(tm) tho