Overpass vs. Nominatim - different results

Hello everyone, I’m new here so first off, I’d like to say hello. I’ve come across an issue that might be a bug, or perhaps it’s something I don’t fully understand.

I’ve noticed that when I use this Overpass query (here’s the link: overpass turbo), which relates to tags for the country of Oman, it seems to return a complete list of tags.

[out:json];
relation(305138);
out tags;

However, when I perform a similar query on Nominatim, I get many more tags.

https://nominatim.openstreetmap.org/ui/details.html?osmtype=R&osmid=305138&class=boundary

For instance, it appears to be missing what seems like a key tag, “official_name:en,” which is present on Nominatim but not on Overpass.

my answer: