Blank lines affect use of computed fig.cap with knitr/rmarkdown to PDF

I use the following code to get consistent figure caption numbers when producing HTML and PDF from the same source:

.format <- knitr::opts_knit$get("")
.tag <- function(N, cap ) ifelse(.format == "html",
                                 paste("Figure ", N, ": ",  cap, sep = ""),

If preceding text does not leave a blank line, the captions are correct in HTML but not in PDF

x = seq(0, 2*pi, length = 100)
plot(x, sin(x))

But it works with a blank line.

plot(x, sin(x))

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