On the playground, when modifying the parameters of a voice that I created in Spanish, either clicking on the octave model or advanced settings, I get an error, restarting the tab and losing all the progress made in the text I want to give voice to. The project does not allow you to select octave 2 because it also gives an error.

The error is as follows: Details of the error

Could not execute 'removeChild' on 'Node': the node to be deleted is not a child of this node.