[QUESTION] Conan revisions feature

Hello

I am really interested for use the (experimental) revisions feature. And i have read the documentation here:
https://docs.conan.io/en/latest/versioning/revisions.html

In the bottom of the page, it is written "server support: bintray".

But if i test with bintray repository, i don't find any revisions (exactly, only one: "0").... :(

$ CONAN_REVISIONS_ENABLED=1 conan search qt/5.13.0@bincrafters/stable --revisions -r bincrafters
Revisions for 'qt/5.13.0@bincrafters/stable' at remote 'bincrafters':
0 (2019-08-03 02:08:25 UTC)

$ CONAN_REVISIONS_ENABLED=1 conan search freetype/2.10.0@bincrafters/stable -r bincrafters --revisions
Revisions for 'freetype/2.10.0@bincrafters/stable' at remote 'bincrafters':
0 (2019-08-13 20:06:04 UTC)

$ conan remote list
conan-center: https://conan.bintray.com [Verify SSL: True]
bintray: https://api.bintray.com/conan/conan/conan-center [Verify SSL: True]
bincrafters: https://api.bintray.com/conan/bincrafters/public-conan [Verify SSL: True]

Did I miss something ?

Thanks !!