convert-to-tarballs is downgrading freedesktop-sdk

For 3.36.1, it's doing:

diff --git a/elements/freedesktop-sdk.bst b/elements/freedesktop-sdk.bst
index 45c66035..de6186bc 100644
--- a/elements/freedesktop-sdk.bst
+++ b/elements/freedesktop-sdk.bst
@@ -4,7 +4,7 @@ sources:
   url: https://gitlab.com/freedesktop-sdk/freedesktop-sdk.git
   track: '19.08'
   track-tags: true
-  ref: freedesktop-sdk-19.08.9-0-g076fe9d30f37224a1bd756a177e33399dad37e8d
+  ref: freedesktop-sdk-19.08.8-0-gacf31516375d7a5fd574745aa37f4e8dd001b07b
 config:
   options:
     target_arch: '%{arch}'

I don't immediately see why. Will try to debug tomorrow I guess. CC @akitouni.