I get a title error and Rplots.pdf when comining Shiny, flexdashboard, child, render_delayed.

If I want to delay the rendering in a child document of a Shiny - flexdashboard, I receive a title error and files Rplots?.pdf. But only when I refresh the viewer.

Two Environments

R version 3.3.3 (2017-03-06)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Debian GNU/Linux 9 (stretch)
Rstudio Version 1.2.1335

R version 3.6.0 (2019-04-26)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 17134)
Rstudio Version 1.2.1335

Main document test.rmd

title: "Test"
output: flexdashboard::flex_dashboard
runtime: shiny
```{r child = "test_child.rmd"}```

Child Document test_child.rmd

You should see the system time.


When I press the button Run Document in Rstudio, the viewer opens with the expected display:


But when I press the refreshing button in the top right corner of the viewer (or resize the viewer), then I see this:

and the following error message

[WARNING] This document format requires a nonempty <title> element.
  Please specify either 'title' or 'pagetitle' in the metadata,
  e.g. by using --metadata pagetitle="..." on the command line.
  Falling back to 'test.utf8'

In addition files Rplots?.pdf are created.

New Child Document test_child.rmd
If I do not delay the rendering, no error message no Rplots?.pdf files.

You should see the system time.


What is going on ?

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