TEXT body with Content-Type: application/x-www-form-urlencoded does not interpolate {{variables}}

Internal - [BRU-4556]

I have checked the following:

• I have searched existing issues and found nothing related to my issue.

This bug is:

• Making Bruno unusable for me.
• Slowing me down but I'm able to continue working.
• Annoying.
• This feature was working in a previous version but is broken in the current release.

Bruno version

4.1.0

Operating System

macOS

Specific OS Version / Distro

macOS 27.0.0 (Darwin)

Describe the bug

When a request uses Body type TEXT and the header Content-Type: application/x-www-form-urlencoded, variables in the body stay as literal {{var}} at send time.

The editor highlights them as resolved, and the URL interpolates correctly. Timeline shows the body was sent unresolved.

This is a possible regression of #2400 (closed as fixed in v1.35).

Root cause: urlencoded interpolation only runs when request.data is an array (Form URL Encoded fields). TEXT body is a string, so that branch does nothing. URL uses a different path, so it still interpolates.

Steps to reproduce

Send POST request with BODY username={{oauth_user}}&password={{oauth_password}}&grant_type=password

Expected: body values are interpolated. Actual: URL is interpolated, body is sent as username={{oauth_user}}&password={{oauth_password}}&grant_type=password

Collection to reproduce

No response

Screenshots/Live demo link