Version: 67.0.3396.99
Reproduction Steps: 
Open a document in Google Docs.1.
2.About five pages into the document, text will begin double-speaking. First, text will be sent to the synthesizer. The synthesizer is flushed before text can be spoken, and the text sent again. This can be seen in "new line," "space," in Google Documents.
3.Pressing up arrow, then down arrow, can often help to reproduce the bug.