SUMMARY
Using Obsidian to click on mailto: links results in nothing in the case of Thunderbird being the mail client.

OBSERVED RESULT
Log "/usr/bin/xdg-email: line 619: thunderbird.desktop: command not found"

run_thunderbird()
{
    local THUNDERBIRD MAILTO NEWMAILTO TO CC BCC SUBJECT BODY ATTACH
    THUNDERBIRD="$1"
    MAILTO=$(echo "$2" | sed 's/^mailto://')
    echo "$MAILTO" | grep -qs "^?"
    if [ "$?" = "0" ] ; then
        MAILTO=$(echo "$MAILTO" | sed 's/^?//')
    else
        MAILTO=$(echo "$MAILTO" | sed 's/^/to=/' | sed 's/?/\&/')
    fi

    MAILTO=$(echo "$MAILTO" | sed 's/&/\n/g')
    TO=$(/bin/echo -e $(echo "$MAILTO" | grep '^to=' | sed 's/^to=//;s/%\(..\)/\\x\1/g' | awk '{ printf "%s,",$0 }'))
    CC=$(/bin/echo -e $(echo "$MAILTO" | grep '^cc=' | sed 's/^cc=//;s/%\(..\)/\\x\1/g' | awk '{ printf "%s,",$0 }'))
    BCC=$(/bin/echo -e $(echo "$MAILTO" | grep '^bcc=' | sed 's/^bcc=//;s/%\(..\)/\\x\1/g' | awk '{ printf "%s,",$0 }'))
    SUBJECT=$(echo "$MAILTO" | grep '^subject=' | tail -n 1)
    BODY=$(echo "$MAILTO" | grep '^body=' | tail -n 1)
    ATTACH=$(/bin/echo -e $(echo "$MAILTO" | grep '^attach=' | sed 's/^attach=//;s/%\(..\)/\\x\1/g' | awk '{ printf "%s,",$0 }' | sed 's/,$//'))

    if [ -z "$TO" ] ; then
        NEWMAILTO=
    else
        NEWMAILTO="to='$TO'"
    fi
    if [ -n "$CC" ] ; then
        NEWMAILTO="${NEWMAILTO},cc='$CC'"
    fi
    if [ -n "$BCC" ] ; then
        NEWMAILTO="${NEWMAILTO},bcc='$BCC'"
    fi
    if [ -n "$SUBJECT" ] ; then
        NEWMAILTO="${NEWMAILTO},$SUBJECT"
    fi
    if [ -n "$BODY" ] ; then
        NEWMAILTO="${NEWMAILTO},$BODY"
    fi

    if [ -n "$ATTACH" ] ; then
        NEWMAILTO="${NEWMAILTO},attachment='${ATTACH}'"
    fi

    NEWMAILTO=$(echo "$NEWMAILTO" | sed 's/^,//')
    DEBUG 1 "Running $THUNDERBIRD -compose \"$NEWMAILTO\""
    "$THUNDERBIRD" -compose "$NEWMAILTO"
^^^^ this is line 619 ^^^^

 if [ $? -eq 0 ]; then
        exit_success
    else
        exit_failure_operation_failed
    fi
}



EXPECTED RESULT

Email program to open


SOFTWARE/OS VERSIONS

Linux/KDE Plasma: 5.27.4
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.3


I think what is going on here might be that because Thunderbird was installed as part of Rocky 9.2 distro there might be some sort of registration issue. Perhaps solved by creating a thunderbird.desktop file? Seems a bit odd if that is the case to rely on that when the program is installed to being within the menu system? 

Is this an error or a unmet requirement?