Plotly graphs are not displayed in knitr output if produced inside a loop

[Stan125]

If plotly graphs are printed inside a loop and not with subgroup, which is necessary if you have a lot of plots, then it just doesn't work.

Input

Consider this minimal working example:

The code for this is here. Sorry, there is no way to to syntax highlighting for .Rmd files so I cannot display it in this issue with the correct code.

Output

Only the second code chunk can yield outputs. The first plots just don't show up in the resulting .pdf file. Here is the resulting .pdf file:
Untitled.pdf

Essentially, if I make a list of plotly objects and print them, knitr does not catch them, even with htmltools and all that. If I ust print them without looping, everything works.

[cpsievert]

Try wrapping the list in htmltools::tagList() #273 (comment)