There have been some changes to ass handling in recent versions. Looking at the version number you’re using, I expect you are using the version from the App Store. The new version with these changes is being processed by Samsung, which shouldn’t take too long, but at this time of year who scan be sure.
Alternatively, you can load the Beta version from USB but it needs to be regularly updated manually, so if you can wait a week or two to try the new store version that is probably worthwhile. I think it will resolve your issues.