Query vs Mutation error handling

[ramihamati]

I am new to graphql and apollo, but I noticed a behaviour which seems confusing to me.

I am using asp .net Hotchocollate for the backend and angular with apollo for the frontend.

If I query for data and an error occurs, I return an error which is catched in the next() callback of the observable. Here I can handle the error in ApolloQueryResult.Error/Errors
-> This behaviour is valid because all returns are 200OK and errors are handled in the errors array

If I mutate and and an error occurs, I return a similar error but in this case it's catched in the err() callback of the observable as an ApolloError
-> This behaviour is different then the one I have in the query.

Is this the right behaviour or there is something I am missing?