IMAP Email returnes header field names twice

[vco1]

Bug Description

As of n8n version 1.79.3 the Imap Email node returns header filed names twice. Like this:

"headers": {
"return-path": "Return-path: <[email protected]>",

To Reproduce

1. Add an IMAP Email node.
2. Run it.
3. Look at output.

Expected behavior

"headers": { "return-path": "[email protected]",

### Operating System

Debian

### n8n Version

1.79.3

### Node.js Version

As in latest Docker container

### Database

SQLite (default)

### Execution mode

main (default)