Can't download modpacks and create custom instances on Linux

[BauerMario2009]

Please confirm the following.

• I checked the existing issues for duplicate problems
• I have tried resolving the issue using the support portal
• I have ensured my Modrinth App installation is up to date

What version of the Modrinth App are you using?

0.11.3

What operating systems are you seeing the problem on?

Linux

Describe the bug

I'm not able to create any custom

instances and I can't download any modpacks. Everytime I try to install/update a modpack I get one of the following error messages:

An error occurred
Unable to read fetch bytes from any source

or

An error occurred
Error fetching URL: error decoding response body

Steps to reproduce

Bildschirmaufnahme_20260310_001157.webm

Bildschirmaufnahme_20260310_002017.webm

Expected behavior

The modpacks should be installed/updated and custom instances should be created without any issues.

Additional context

OS: Manjaro with KDE Plasma
App version: 0.11.3 (flatpak)