Captivate 8 to 9 Issues

Our company had bought licenses for Captivate 9 so that all designers can upgrade their softwares from Captivate 8. However, we've been reading lots of issue with contents imported into Captivate 9. Our problem is that we have developed lots of content using 8 and we can't afford to ruin those contents in case we need to make any edits. Can you please give us a list of known issues between Captivate 9 and 8 compatibility?