Certain Minnan diacritics not rendered correctly in UI (display-only issue)

Some Minnan text containing specific diacritic combinations does not display correctly in the UI, even though the underlying characters are valid. For example, in words like Kó͘-chhoe (the second character) or oo-ta̍t-á, the character a̍ (a + vertical dot) fails to render properly.

When the text is copied and pasted elsewhere, it displays correctly, indicating this is a display/ rendering issue, not a data problem.

Would appreciate help identifying whether this is a font fallback issue, missing font support, or text-rendering limitation in the current UI.

Start by reproducing the issue in the UI with the examples Kó͘-chhoe and oo-ta̍t-á, then inspect how the current interface handles font fallback and text rendering. Done means the Minnan diacritics render correctly in the UI while copied text remains unchanged and correct.

Written by the indexing model from the issue text.