Strange behaviour of dewdrop theme with `new-section-slide-fn`

[dhnam]

#import "@preview/touying:0.6.1": *
#import themes.dewdrop: *

#show: dewdrop-theme.with(
  aspect-ratio: "16-9",
  config-common(
    new-section-slide-fn: (section => {
      touying-slide-wrapper(self => {
        touying-slide(
          self:self,
          {
            utils.display-current-heading(level: 1)
            components.mini-slides(fill: self.colors.primary, display-subsection: false)
            // layout(fn=>none)
            // grid()
            // []
          },
        )
      }
    )
    }),
  ),

  navigation: none,
)

= Subtitle 1
== subsub1
inner1

= Subtitle 2
== subsub2
inner2

In this code, uncommenting any of those three comments will make presentation worked as expected.

But commenting out all three of those will show this: section slide (Subtitle 1) -> subsub2, inner1 -> section slide (Subtitle 2) -> subsub2, inner 2.

Furthermore, if I add this section with no content;

= Subtitle 3

It becomes weirder. Section (Subtitle 1) -> Subtitle3, inner 1 -> Section (Subtitle 2) -> subsub2, inner 2 -> Section (Subtitle 2)

All of these behaviour is not shown with those comments uncommented.