Problem with automatically generated subtitles ?

Hi everyone.
I've detected a problem with the voices generated by Storyline's AI and the subtitles that are automatically generated at the same time.
I copy and paste a prompt and check the “Generate subtitles” box. Everything is perfect. Of course, the subtitles are a mess, as usual. It takes me a long time to cut and arrange them perfectly.
Then I decide to change (for example) a single word in my prompt. To preserve my work on the subtitles, I uncheck the “Generate subtitles” box. As a result, the subtitles are still completely recreated, once again in complete disarray.
Is there something I'm not understanding (between “Generate subtitles” and NOT “generate subtitles”)?
Should I do something else (other than exporting my subtitles and reimporting them)? This seems like a bug, doesn't it? Has anyone else noticed this? (I haven't found any previous posts on the subject). It seems to me that it worked logically and normally in a previous version: when I uncheck the “Generate” box, the subtitles that have already been created are not damaged. Am I wrong?

Have you noticed the same thing? Any ideas or tips?

Thanks

Thierry