Using &text=<text> to limit glyphs and file size does not seem to work

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Adding &text=<text> to the API call to limit the Roboto Flex glyphs and font file size does not seem to work.

Example:

https://fonts.googleapis.com/css2?family=Roboto+Flex:[email protected] produces the following CSS (only showing Latin):

Adding &text=Hello to the request https://fonts.googleapis.com/css2?family=Roboto+Flex:[email protected]&text=Hello produces the same CSS, and therefore the same font file.

I have checked the downloaded font file for both requests. They are the same size. I would expect the second request to produce a smaller font file.

Also, I have tried the same test with another variable font - Open Sans - and it worked as expected. That is, the second request produced different CSS to the first, and the resulting font file is considerably smaller.

It appears that the Roboto Flex font is ignoring the &text= command.