i have the same issue. Missed approach, and even procedure turns do not show up on the 5600
Check the following:
1. You must have the Dynon SV-ARINC module, the AF-ARINC module does not get the hold data.
2. You need the current software on the EFIS
3. Verify that you have the correct ARINC setting in the IFD -> GAMA 429 GRAPHICS w/int