Bug: Text added to a trend line does not appear on the chart

I’m trying to add text to a trend line using the Trend Line settings. However, no matter what text I enter, it does not appear on the trend line after I save the settings.

Steps to reproduce:

1. Go to the chart.

2. Select the Trend Line tool.

3. Draw a trend line on the chart.

4. Open the trend line settings and go to the Text section.

5. Enter any text and confirm/apply the changes.

6. Check the trend line on the chart.

Actual result:
The trend line remains unchanged and no text is displayed.

Expected result:
The text entered in the Trend Line settings should be displayed on the selected trend line.