Visual Testing checkpointName not supported Chinese

I use Mobile.takeScreenshotAsCheckpoint (“产品购买”),can not see pic.
I use Mobile.takeScreenshotAsCheckpoint (“14”),can see pic
I think checkpointName not supported Chinese,Maybe the request character set is not using UTF-8?Can anyone Help me?

Screenshots:


It’s an issue handling request encoding. We’re going to fix it asap.
Thanks for your reporting.