Intermittent Mask Annotation is Not Saved

**Describe the bug**
Hello, I am encountering intermittent bug when the ``brushLabels`` is not saved.

**To Reproduce**
Sadly, I even can not reproduce the issue, but the annotator's team complain that they found 3 occurrences from thousands of task. What they do are:
1. Annotate image with brushLabel
2. Annotator gave each of masks with defined labels
3. Click save to save the masks to server

**Expected behavior**
The expected behaviour is the data is 100% saved both of the masks and the metadata.

**Screenshots**

**Environment (please complete the following information):**
- OS Users: Windows 10
- OS Servers: Ubuntu 20.04.6 LTS
- Label Studio Version Docker Image: 1.13.1

**Additional context**
I have a hard time because the last updated_at of the data is roughly 9 months to 1 year ago. Currently, I suspect that the error happen when user request to update failed (either because bad internet connection, or hardware issue on users side). But still not sure