I'm seeing this in my org folders and multi-branch projects (aka, anything using branch-source). It appears that Jenkins is automatically performing the LFS pull even though it hasn't been configured to do so.
The workaround I used is to explicitly enable it (add the Git LFS pull after checkout option) which configures the auth and allows it to work properly. Note that this is before the Jenkinsfile is actually processed, this is happening for me in the checkout that happens on master in order to read it.
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