With thanks to the user who posted this to the forum, I have created this as a forum sticky so that other users who attempt to run Sound Forge Mac under OSX Catalina can understand why they see an error message about "Bad Crumb" and the software will not run.
"Greetings from Sound Forge Support,
Thank you for contacting us. Unfortunately, at this time there is no clear answer to what the future of Sound Forge Pro Mac will be. There are no plans in the foreseeable future to update the program to be compatible with Catalina, and it is hard to say whether or not the Mac line will continue at all. I apologize for the inconvenience of this and we thank you for your time and understanding."