Not sure if this is intended or not, but as soon as I (a mage) take my own portal, said portal disappears and party members cannot use it. Haven’t tested this with other ports, but I consistently see it happen with Portal: Oribos.
this has been the way portals have worked for quite a long time, the portal caster needs to stick around till everyone uses it. (or a reasonable time-frame, I usually give it a minute for m+ and keep it open for about 2 minutes for raid groups)