When we transition to Closed, one of the required fields is resolution.
However, in most all cases, resolution is already populated when it is Resolved - it could be fixed, complete, answered, cannot reproduce,etc.

However, since it is required, you have to input something and the transition then changes everything in that bulk action to the one selected.

Consequently, you have to filter out by resolution before doing a bulk transition which is inefficient.

Either don't make resolution required (and if it's not done, those issues don't complete the transition); or, only override the resolution if one doesn't exist (it is currently unresolved).

Else the integrity of the data is affected.