Consistent problem, even with a clean, default vault and no plugins or third-party themes. If I toggle the “Legacy editor” on (and restart Obsidian), the problem goes away, but returns once I return to non-legacy mode.
Additional information
This has been brought up before on Discord: https://discord.com/channels/686053708261228577/908079085257908234/909528059206594581.
With the update to 0.13.10 the situation is the same:
With Legacy Editor toggled on, I can use the macOS system dictation, but while I am dictating, the text is all underlined and none of the paragraph breaks that I dictate (“New Paragraph”) are visible, until I stop dictating, and then the paragraph breaks are visible and the underlining disappears.
With Legacy Editor toggle off, and get the duplication mentioned in my earlier post – whether it’s in Source mode or Live Preview mode.