How to publish more than 5 distortion parameters through sensor_msgs::CameraInfo structure?

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So, I figured out what was wrong with my code. Actually the d data member of sensor_msgs::msg::CameraInfo class is a vector and you need to resize it to the correct size before filling in the values. So if suppose your distortion model uses 8 coefficients then you need to resize the d vector to eight. In my case, I had three radial coefficients (remaining three radial coefficients had to be assumed to be zero) and two tangential coefficients returned by the sensor driver. And I was resizing the vector as d.resize(tangential_count + radial_count) which was equal to d.resize(3 + 2). So, although subsequent ROS nodes in my pipeline were expecting eight distortion coefficients (including three tangential coefficients that were zero), it was only receiving a vector of size five because I was using count variables to resize the vector.

So, it is more of a careless programming mistake on my part, but I would still leave this answer here in case anyone encounters something like this in the future.