Facing issue with "content-type" header in HTTP Header Manager Using JMeter 5.5 version.

### Expected behavior

File upload with https POST request should work fine with JMeter 5.5 when Header Manager content-type is set to application/json.

### Actual behavior

_No response_

### Steps to reproduce the problem

I have https POST request, with file upload option.
Header Manager has content-type set to application/json:

Once the request is being sent, getting below error:
{"timestamp":"2023-05-08T09:17:39.942+00:00","path":"/EndPoint/URL","status":400,"error":"Bad Request","message":"Invalid value for header 'content-type'. Expected: 'application/json + Given: multipart/form-data; boundary=JAeP7VH8u1DA8_a_3mg51MC70D1STLj","requestId":"ID"}
In Request Headers, content-type is automatically getting set to multipart/form-data even when it is set to application/json in header manager.

Note: The above error is observed with latest JMeter version i.e. 5.5.
With the older version of JMeter **5.3** the same https request works fine.

### JMeter Version

5.5

### Java Version

openjdk version "1.8.0_362"

### OS Version

OEL 7.9