if you create a new dimension and you add a custom portal texture, when you open the mod element again it is not selected so every time you want to edit your dimension you have to specify the portal texture again.
Issue comments
Because it was fixed. We have acknowledged it, managed to replicate it and managed to fix it. You can see that it is now in the changelog (https://mcreator.net/changelog) which means this feature will be merged in MCreator 1.8.3.
I will check what could be causing this and try to fix it.