Theorems env with only a list wrongly number the title as part of the list

[cderv]

See https://community.rstudio.com/t/bookdown-v0-25-exercise-titles-should-not-be-numbered/143961/2

---
title: test
output: bookdown::html_document2
---

# Excercises

Do exercises \@ref(exr:exr-1)

::: {#exr-1 .exercise}

1)  Open RStudio.
2)  Write `1 + 9` to console.
:::


::: {#exr-2 .exercise}
\ 

1)  Open RStudio.
2)  Write `1 + 9` to console.
:::

::: {#exr-3 .exercise}

Title 

1)  Open RStudio.
2)  Write `1 + 9` to console.
:::

See how first one as the title with label be part of the list

[github-actions]

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