Text-to-Speech Problems

Hi All. For the past few weeks, I've been experiencing a fairly consistent issue with the AI Assistant Text-to-Speech feature in Storyline. Essentially, any time I generate an audio clip, the last phoneme (the final sound) is cut off. Unless I'm building something with background music, this results in a noticeable dropout and/or mispronunciation. The only remedy, because AI Assistant always seems to want to truncate the last phoneme, is to add a period and a random word, then go back and edit out the random word before finalizing the project. This doesn't seem like a feasible long-term solution. For context, if it matters, I'm using the voices River, Chris, and Jessica. I've provided an example below. If anybody else experienced this and has a solution, please share. Thank you!