Link of cloned decision block is disconnected when update attributes on master block.
Steps to reproduce:
1. Create a decision block.
2. Add Output to the block. In this case, outputs of the block are A, B, C.
3. Clone the block.
4. Connect output A and B from master block. Connect output A and C from cloned block.
5. Update any attributes like Notes of master block, and then output C is unlinked from cloned block.
This problem was fixed on ARD 2.5.000.3 (GA version)
If you feel this behavior is inconvenient, please upgrade to ARD 2.5 or later.