Equation numbering increases with `#pause` on each subslide

[yjcui]

When subslide is used (with #pause, #only, etc.), numbering of equation keeps increasing on each subslide, where they should remain the same number.

Code snippet for testing.

#set math.equation(numbering: "(1)")

#slide[
  - Item 1
  #pause
  - Item 2
  #pause
  - Item 3

  $ alpha + beta = f(x) $
]

[OrangeX4]

This is a known issue and difficult to fix in touying right now, which will need to wait until typst implements frozen state to deal with this. https://laurmaedje.github.io/posts/frozen-state/