CC20 complaining on "missing data" 33 § 4, CC19 does not.
Two project files I created on CC19 this week and continued to work on in CC20 are unreadable after saving and re-opening. On CC20 the error is 33 § 4 (Missing Data). This also applies to the render process in AME which can't start.
The same file opens correctly on CC20 in OSX and CC19 on Windows as well.
Other files created in CC20 are opened without any issues.
Adam S. commented
Is your file using the rotobrush? I believe this has something to do with the rotobrush in 20 as I experience this issue as well. Opening and then saving it as a new file in 19 then opens fine in 20.