There are a number of assets/content missing from the Paper2D plugin content within the Content Browser.
Whether you create a new 4.14 project or upgrade from a previous version, these assets are removed from the project which can cause a number of referencing errors within that project.
I could not find any Paper 2D changes made to 4.14 outlined in the release notes that mention this change, if intentional.
Yes, this does not occur when moving up to 4.13.2 or within a new 4.13.2 project.
1. Create new Paper2D project using 4.13.2
2. Show the Paper2D plugin content within the Content Browser.
3. Upgrade or Create new Paper2D project in 4.14.
4. Repeat step 2.
5. Compare results.
Outcome Certain sprite materials and assets are missing
Expected The assets still exist when moving to 4.14.
Head over to the existingAnswerHub thread and let us know what's up.