Upgrading a copy of a project from 4.14 to 4.15 appears to be resetting the names of enum elements on switch on enum nodes.
Opening the enum, saving it, and then restarting the project seems to resolve this issue as a workaround in the meantime.
This seems to be a regression, as it did not occur when converting 4.13.2 projects to 4.14.3 based on my tests.
Result: Notice that on the Switch on Enum node, all of the enum element names have been reset.
Expected: The names would remain the same
Head over to the existingAnswerHub thread and let us know what's up.