`nbdev_test` fails to run tests when preceded by `langchain.embeddings.HuggingFaceEmbeddings`

[amaiya]

Importing and instantiating langchain.embeddings.HuggingFaceEmbeddings causes nbdev_test to malfunction and not execute subsequent tests.

Steps to Reproduce

1. In a new repo folder (using nbdev_new) or existing nbdev repo, add the following in a notebook cell (e.g., in 00_core.ipynb):

   from langchain.embeddings import HuggingFaceEmbeddings
   emb = HuggingFaceEmbeddings()
   assert 1==2, 'never executed by nbdev_test'

2. Run the test: nbdev_test --do_print --file_re core.ipynb.
3. The nbdev_test returns Success when it should be failing.

Interestingly, it only happens with langchain.embeddings.HuggingFaceEmbeddings, not when using sentence_transformers directly.

[amaiya]

Closed as the problem goes away when re-installing from scratch.