Buses that contain signals of enumerated data types cannot pass through a block that requires a nonzero scalar initial value (such as a Unit Delay block).
Root level bus outputs cannot be logged using the Configuration Parameters > Data Import/Export > Save to Workspace > Output option. Use standard signal logging instead, as described in Export Signal Data Using Signal Logging.
Inputs to a Bus Creator block must have unique names. If there are duplicate names, the Bus Creator block appends (signal#) to all input signal names, where # is the input port index.