Deployment environment variables broken when encrypted / masked

How to reproduce:

• Base64 encode this string: the-quick-brown-fox-jumps-over-the-lazy-dog
  Result: dGhlLXF1aWNrLWJyb3duLWZveC1qdW1wcy1vdmVyLXRoZS1sYXp5LWRvZwo=
• Create new deployment environment variable under "Pipelines / Deployments" - call it TEST. Click the lock icon to encrypt / mask it.
• Create a bitbucket-pipelines.yml file, and in it run the following command:
  echo "$(echo $TEST | base64 --decode)"
• Run the pipeline. Check the pipelines view in bitbucket, and expect to see the original string in the console:
  the-quick-brown-fox-jumps-over-the-lazy-dog
• Instead, we see this string:

Ch僟0�{�Q��hMv��
�T�jDw����SO3�Br�\�^��R����```