Code snippets using evaluation, for example the ts below seem to be getting evaluated twice when triggered with Shift + Tab (tested with recent Chrome and Firefox). The result looks like the attached image for the below snippet.
snippet ts
`r paste("#", date(), "------------------------------\n")`
On a side note, when triggered with autocomplete + Enter, all works as expected.
Also tested on RStudio Server 1.1.453 where the issue is not present.