datauri macro not working

[RA]

I have a svg image as a tiddler, and for some reason `datauri` macro is not returning a working data URI for it. Meta and svg attached. Stylesheet below. (Saved as type `text/vnd.tiddlywiki` and tagged with `$:/tags/Stylesheet`

\rules only filteredtranscludeinline transcludeinline macrodef macrocallinline macrocallblock

.rip {
  background: url(<<datauri "images/test.svg">>) bottom right;
}

[RA]

Actually, when I paste the result in the browser address bar, I do get the image, so looks like `datauri` returns the result in a format suitable for the address bar but not suitable for CSS. I'm missing something simple here... Halp!