After upgrading to Jenkins 2.366, a notification showed up that I had "old data". I discarded the old data (after copying it from the UI) and did some research. Most of the articles I found said that there was an issue with a plugin the project was using. The two projects are my only projects using the S3 Publisher plugin. I opened the Configuration for one of the plugins and tried to save it immediately without making any changes and it threw an error ID but nothing in my log files. A little further research and another notification about old data and I realized it was the trace information being produced. I removed the plugin and reinstalled it, reconfigured my project(s) and still, it errors but the data does save. Here's the output from the trace/old date:

ConversionException:
---- Debugging information ----
cause-exception : java.lang.reflect.InaccessibleObjectException
cause-message : Unable to make field private static final java.lang.String java.util.logging.Level.defaultBundle
accessible: module java.logging does not "opens java.util.logging" to unnamed module @2767e23c
class : java.util.logging.Level required-type : java.util.logging.Level
converter-type : hudson.util.RobustReflectionConverter
path : /project/publishers/hudson.plugins.s3.S3BucketPublisher/consoleLogLevel/name
line number : 104 -------------------------------,
CannotResolveClassException: value,
CannotResolveClassException: resourceBundleName,
CannotResolveClassException: pluginFailureResultConstraint,
CannotResolveClassException: userMetadata