Regression : apk not found in repository created by repomaker (the file is available from a computer)

• Device OS and version: Android 8.1.0
• Device model/manufacturer: Fairphone 2
• F-Droid version (in the About screen): 1.6
• F-Droid privileged extension version (if installed):

What did you do? (clear steps if possible)

• trying to upgrade an app (Langis) from a repository built with repomaker. The repository url is https://gitlab.com/TheCapsLock/fdroid-patched-apps/raw/master/fdroid/repo?fingerprint=313D9E6E789FF4E8E2D687AAE31EEF576050003ED67963301821AC6D3763E3AC
• updated repository
• tried to install langis 4.38.3 got following error :

• tried to download same exact URL (https://gitlab.com/TheCapsLock/fdroid-patched-apps/raw/master/fdroid/repo/langis-website-universal-release-signed-4.38.3.apk) from a laptop : I can download the file.

What did you expect to see?

• I expect FDroid to let me download a file which exists :)

What did you see instead?

• Cannot upgrade an app