Your version number is an IP address. Among the many problems that can occur, like leaving out --ppapi-flash-version= or putting a space after it:

  exec /usr/bin/chromium --ppapi-flash-path=/usr/lib/adobe-flashplugin/libpepflashplayer.so --ppapi-flash-version=$(grep version /usr/lib/adobe-flashplugin/manifest.json | cut -d '"' -f 4) "$@"

If it is for vanity then as another comment suggested include it in the name:

  python3 --version