Build plan password variable could not be transferred to deployment

Issue Summary

Build plan password variable could not be transferred to deployment even though it works with normal variable

Steps to Reproduce

1. Create Plan Variable test.username and test.password
2. Run the build
3. Create a deployment environment with Script task to echo the variables
4. Run the deployment

Expected Results

Both variables managed to be transferred to deployment

Actual Results

Only test.username is transferred to deployment. The deployment fail with unable to find test.password variable

Notes

For better password variable storage in database, plan password variable could not be transferred to deployment anymore

Workaround

Configure Deployment Environment Variable but password changes will need to modify multiple places