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I sent a demo to Apple that confirmed that it fails on latest version. Before 10.15.1 release, they confirmed that this bug was resolved but I contacted them to indicates it's doesn't work yet.I'm waiting for Apple response. They have to investigate on this bug from my demo project.Apple response :06/11/2019Sorry about the delay in responding, but it looks like the fix for the problem we knew about was in 10.15.1, which means that you’re running into something else[....]Would you mind submitting a new bug report for 10.15.1, including a new sysdiagnose and steps to reproduce, and let me know the bug number? 08/13/2019 :I’m able to reproduce the issue as you described, using your sample project. However, it’s going to be necessary for you to submit a new bug report, because the existing one has already been closed as a duplicate (because it looked like you were running into an issue that was fixed in 10.15.1)....Waiting for response

I used a TSI to get help of Apple Support. They confirmed that macOS Catalina should support offline playback but this is a known bug. It'll be fixed on future versions (maybe 10.15.1 beta, otherwise, we should look for it in next release). Wait and see 😉

Same problem on Macbook pro 2016 and iMac 2017. Nothing in Software Update Preferences pane.There are enrolled and rebooted but nothing...

I think it's possible but I cannot accomplish offline playback too with Catalyst. Does Apple guys have a solution ?