OdfDrawFrame childnode SvgTitleElement is serialized as SvgDescElement

[django9876]

I am working with alternative texts for images, which are saved as SvgTitleElement, a childnode of an OdfDrawFrame object. The odftoolkit parses an odt-file correctly, but when saving it, the SvgTitleElement is converted to a SvgDescElement. On Reopening the file, the child node of the instance SvgTitleElement is lost, the libreoffice-writer does not show an alternative text.
Version: 0.12.0 and 0.10.0

[svanteschubert]

Could you please provide a draft pull request with a test case of your scenario, to easily reproduce your problem?

[django9876]

I fail. I will provide test file at least.
TestCase.odt

[svanteschubert]

I have added PR #295 with a test case that shows that on the current master branch, the problem no longer exists.
You may copy the test to your environment. Sorry, I can not reproduce the problem...