It's a design feature of the architecture Panarchy, nothing to do with EasyBCD.
The MBR searches for the "active" primary partition. A logical partition cannot be "active".
See Vista Help
- There can be only one active partition per physical hard disk.
You can put a BCD on a logical disk, but you can't boot from it.
- If you have multiple hard disks installed on your computer, it is possible for each hard disk to have a partition set as active. However, the active partition on the first hard disk that your computer's basic input/output system (BIOS) detects is the one that will start the computer. For more in-depth information, go to the Microsoft website for IT professionals.