I get similar strange results,
1. If I set all options to Zero, meaning he just stands by the bomb in line of site, Then I drive up to the bomb it does not detonate.
2. If I set any of the options beyond zero it appears he never finds a location to set off the bomb as the body continually respawns as Gnarly Sees above.
3. Seems I have the same issues and thats locally hosted in the editor.