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