Ability to downgrade font version / disable variable font

I stumbled upon a problem yesterday. I needed to add some more font-weights to the site. So I went to https://fonts.google.com/specimen/Montserrat and prepared new css file with direct links to more weights. Before I used v12 version of the font, now I see that Google Font delivers v24 version. Wow, twice the good, I thought.

But there are some problems (for example: https://github.com/JulietaUla/Montserrat/issues/125 and https://github.com/JulietaUla/Montserrat/issues/129) that prevents use of v24 of the font.

Also I noticed that for v24 Google Font generates the same woff2 link for all font weights and chars. So this may be a problem in variable font.

Is it possible to get the links to the previous versions of the font? Or option to deliver of fixed-weight fonts instead of variable one?

I suppose this is not the first/only/last situation when new version and/or new delivery method can produce errors.