Which Umbraco version are you using? (Please write the exact version, example: 10.1.0)
13.2.0
Bug summary
There are multiple methods that now return nullable types, that can safely be removed. I think this is a good QOL fix and prevents unnecessery null checks in codebases.
Solution
Check for info messages from the compiler that mention that the nullable return type can safely be changed to a non-nullable return type