When exporting, the zip file contains files for labels, but the file is empty

**Describe the bug**

When annotating images for a semantic segmentation task, after annotating the images and trying to export the dataset in YOLOv8 with OBB format, i get a zip file, which on extracting has two directories (images, labels) and two files classes.txt and notes.json . On inspecting the labels directory, there are txt files (which correspond to the images), but when opening the txt file it seems to be empty!

**To Reproduce**
Steps to reproduce the behavior:
1. Create a new project, and set the project details
2. Upload the images
3. In the labelling setup tab, select semantic segmentation and set the classes
4. Annotate the images
4. After annotating, export the dataset
5. Select YOLOv8 OBB with Images as the format and download the dataset
6. Unzip the file and inspect the labels directory

**Expected behavior**
Each labels file should contain the coordinates of the mask of each object in the seen

**Screenshots**


**Environment (please complete the following information):**
- Ubuntu 22.04 lts
- Label Studio 1.18.0