I recently upgraded Jenkins version 2.277.2 LTS which is upgraded successfully but during testing found below issues.

1) Not able to trigger another job from Test to Production environment using 'Parametrized Remote Trigger' plugin.(Attached)

2) Not receiving all the values in Email notification but receiving only format as like below.

*****************
Subject: $PROJECT_NAME - Build # $BUILD_NUMBER - $BUILD_STATUS!

$PROJECT_NAME - Build # $BUILD_NUMBER - $BUILD_STATUS:

Check console output at $BUILD_URL to view the results.
*********************

after all these issues I regressed to previous version.