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This problem happens on MacOSX 12.6 with voice over, on both chromium and safari.
I originally noticed the issue when using pandoc with its --katex option
but I can reproduce the issue in the demo as well.

When rendering the following expression:

49 + 51 = 100

The numbers aren't read out.
When I get to the part where the numbers are,it reads it as if there are two (or three) different items,
one for each digit.

If one right clicked on the output
and selected "inspect"
in the generated MathML
the <mn> tags for the numbers
would contain multiple elements under them,
also one for each digit.
I guess something about the way KaTeX generates those elements
causes multiple nodes to be created in the DOM,
which then confuses voice over while manipulating it.