[Bug]: Artifacts present in hevcencode output with B-frames

### Which component impacted?

_No response_

### Is it regression? Good in old configuration?

None

### What happened?

### Which component impacted?

_No response_

### Is it regression? Good in old configuration?

None

### What happened?

1. In Linux or Browser or Applications...

**Hardware:** 13th Gen Intel(R) Core(TM) i7-1355U
[cpuinfo.txt](https://github.com/user-attachments/files/23936709/cpuinfo.txt)
**OS:** 24.04.1 LTS (Noble Numbat)
**Application:** [hevcencode](https://github.com/intel/libva-utils/blame/master/encode/hevcencode.c) from libva-utils @ b4abf4e2 and GStreamer 1.24.2

2. With libva/libva-utils/gmmlib/media-driver version

**libva-utils version:** b4abf4e2 (master)
**libva version**: 2.23.0.pre1
**gmmlib version:** 3a256e6762eedd971a56f67804d8a57eb4239c6e (master)
**media-driver version:** intel-media-25.4.5

3. Run hevcencode
```
ffmpeg -y -f lavfi -i testsrc=size=1920x1080:rate=30 -t 10 -pix_fmt nv12 output_nv12.yuv
./encode/hevcencode --srcyuv output_nv12.yuv -w 1920 -h 1080 --fourcc NV12 -n 300 --ip_period 3 --intra_period 10 -o output.h265
```

After playing it back with `ffplay`, artifacts are displayed (and a similar behaviour happens with gstreamer):

File output attached:

[output.zip](https://github.com/user-attachments/files/24588198/output.zip)

### What's the usage scenario when you are seeing the problem?

Playback, Transcode for media delivery

### What impacted?

_No response_

### Debug Information

_No response_

### Do you want to contribute a patch to fix the issue?

None