Incorrect spacing around decimal point in Keynote built-in LaTeX equations for some math alphabet commands

• with macOS 26.5.1, Keynote 15.3
• Equations inserted using Insert → Equation (built-in LaTeX support)

The built-in LaTeX equation renderer inserts excessive spacing around the period (.) with certain math alphabet commands, both in the equation preview and in the rendered equation on the slide. The problem affects decimal numbers as well as periods between letters.

The period entered is the standard ASCII full stop (Unicode U+002E), not a middle dot or multiplication dot. The Mac OS number format is set to use the period as decimal point. The same character is rendered correctly in ordinary text and in some LaTeX math styles.

Expressions rendered correctly with normal spacing around the decimal point : 123.456, \mathrm{123.456}, \boldsymbol{123.456}

Expressions rendered incorrectly with excessive spacing (like 123 . 456 or ABC . DEF) around the decimal point : \mathbf{123.456}, \mathit{123.456}, \mathsf{123.456}, and \mathtt{123.456}, \mathit{ABC.DEF}, \mathsf{ABC.DEF}, and \mathcal{ABC.DEF}

With \mathbf{1.2+3.4} both decimal points receive the excessive spacing.

Using braces does not solve the problem. \mathbf{123{.}456} exhibits the excessive spacing.

Comparison with comma : the expression \mathbf{123,456} shows the expected punctuation spacing after the comma only. This indicates that the renderer distinguishes between commas and periods, but treats the period incorrectly in some math alphabet commands.

Workaround : replacing the period with a text-mode period eliminates the problem: \mathbf{123\text{.}456} renders correctly.