Bat calls using different workspace paths

Hi

Below is a log from a failing build.  There are two bat calls back to back but the workspace path changes for some reason.

The worker node only has a single executor.

bat "tool args"

bat "tool args" - path is changed to @2

C:\jenkins\workspace\ingredient> <tool being called>

Tool output, you can see the tool reading a file in the current workspace

Parsing manifest: 'C:\jenkins\workspace\ingredient\Manifest.xml'

tool success

//second bat call - path now has an @2

C:\jenkins\workspace\ingredient@2\Build>

[ERROR] Manifest 'C:\jenkins\workspace\ingredient@2\Build\Manifest.xml' does not exist

script returned exit code 1

Can anyone explain what is going on here?