When using ${JELLY_SCRIPT,template="mod1.template"} I get the error that was reported about Groovy scripts for Jenkins-28202, Jelly file [mod1.template] was not found in $JENKINS_HOME/email-templates

Nothing was changed in my environment and the file was used fine before. The file does exist and has the full filename of mod1.template.jelly but now it won't work.
Doing a Test email and putting the full filename there it does find it in the correct location it is only when a build fires it off that this is failing.