Feeds Tamper (plugin dissapears)

Backdrop 1.19
Feeds 1.1.1
Feeds Tamper 1.2.2

I've created a Feeds Importer with one item for a taxonomy term...

Catalog (taxonomy_catalog)
  with "Search taxonomy terms by - Term name"
          Auto create
         Create the term if it doesn't exist.

I then go into Tamper and add a Plugin to "Explode" and use ">" as the string separator... and save etc...

I go back to import and it fails with an error...
     Missing bundle property on entity of type taxonomy_term

So When I then go back to Edit the feed and "Node Processor" "Mappings" and check the settings for Catalog... and save...the go back to Tamper, the Plugin isn't there.

Is this a bug or am I missing something?

Hope someone can help.

Thanks in advance.

Steve