[AtlasMap] Unable to decompress the aggregate mappings catalog buffer

after creating an integration with several steps and a conditional one, which included 4 data mapper steps, I went to remove the first data mapper to recreate the source and destination data templates. I went and re-added a data mapper.
On opening this I'm now presented with the error in the screenshot
This prevents me from proceeding with configuring the whole integration.

I attached the integration log generated with the Support button.