AutoMapper.Collection.EFCore

InnerException: ' is already being tracked. When attaching existing entities, ensure that only one entity instance with a given key value is attached.

var parent = await _context.Parents.Include(p => p.ChildrenArray).FirstAsync(p => p.Sub == request.Sub);

// one of the nested properties is a List
_mapper.Map(request, parent);

// error here
await _context.SaveChangesAsync();