Labeling R code chunks prevents blogdown from linking pictures correctly

[harlecin]

Inserting a picture in a chunk like this works fine:

```{r}
plot(iris)

But if I label the code chunk, the figure is not linked correctly, i.e. the html page shows the missing-image-icon:

```{r not working}
plot(iris)

Putting quotes around the label does not work for me either:

```{r 'not working'}
plot(iris)

Thx a lot btw, for this awesome package:)

[yihui]

Please see the last paragraph on this page: https://bookdown.org/yihui/blogdown/output-format.html (Yeah I know it is kind of surprising and hard to find)

[harlecin]

Thx a lot!

[yihui]

FYI, if you reinstall the devel version of blogdown here, this issue should be gone, but I still recommend you not to use spaces in chunk labels.