formatting problems with multiple tables and echo: fenced

Bug description

When I use echo: fenced block option and have multiple tables in the block, the second table loses the sub-caption and the bold formatting of the header row. With echo: true everything is fine.

Here is a minimal example

---
title: results
format: html
---
 
```{r}
#| echo: fenced
#| label: tbl-fenced
#| tbl-cap: "Two tables"
#| tbl-subcap: 
#|   - tab1
#|   - tab2

gt::gt(head(mtcars))
gt::gt(head(mtcars))
```

quarto --version 1.2.198
Ubuntu 18.04.6 LTS
RStudio 2022.07.1+554 "Spotted Wakerobin" Release (7872775ebddc40635780ca1ed238934c3345c5de, 2022-07-22) for Ubuntu Bionic

Checklist

• Please include a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
• Please format your issue so it is easier for us to read the bug report.
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