cannot render an "error"-chunk

[produnis]

Hi there,
I have an error-chunk in my quarto-book which is there for learning reasons:

```{r}
#| error: true
# this won't work!
2,3 - 9

while this worked nice some weeks ago, if I try to render my book, I get error message

Quitting from lines 106-109 (rechnen-mit-r.qmd) 
Error in parse(text = code, keep.source = FALSE) : 
  <text>:2:2: Unerwartete(s) ','
1: # this won't work!
2: 2,

Calls:  .main ... block_exec -> eng_r -> %n% -> <Anonymous> -> parse_only -> parse

I am on archlinux and tried quarto-cli-bin (which is version 1.2.269) and quarto-cli-git (which is version 1.3.1) but I get the same error with both of them....

Is there anything I am missing?

I did some further testing. With a Brand New book Project, everything works just fine....

Seems I have some typos in my real book, but have not find them yet.....

[produnis]

I had this in my _quarto.yml:

knitr:
  opts_chunk:
    cache: true
    cache.path: '_cache/'

by removing it, everything works nice again...