Search is broken

[Moltresrider]

trafficstars

I tried to search for "minecraft:end_portal" and it tells me no results, even though I KNOW that there are End Portals in my world, I just do not remember where they are located.

[NeoForce0]

for end portals, just use the ender eye to guide you to them. That's the vanilla method. You have to load the chunks to be able to find them with nbtstudio

[tryashtar]

Let's see a screenshot of your failing search