Sideloaded update does not download on device

Hello!
A player of my game Test Flight had a problem with updating the game from version 1.0 to 1.2 (original post: Discord).
He uploaded the new version on the sideload page. On device, an update was shown but it was still version 1.0 and not 1.2.
He had to remove the game from both the device and the sideload page for the update to apply correctly.

Any idea what happened?

Here is the pdxinfo from the 1.0 version:

name=Montgolfier Test Flight
author=Raphael Calabro
description=Embark on the first hot air balloon flight and try to fly the farthest possible.
bundleID=fr.rca.montgolfier
imagePath=/
version=1.0.0
buildNumber=8
pdxversion=20400
buildtime=768701349

And the pdxinfo from the 1.2 version:

name=Montgolfier Test Flight
author=Raphael Calabro
description=Embark on the first hot air balloon flight and try to fly the farthest possible.
bundleID=fr.rca.montgolfier
imagePath=/
version=1.2.0
buildNumber=14
pdxversion=20500
buildtime=772148412