[BUG] Descriptions of Tasks/Epics cannot be edited

[twothe]

Describe the bug
When trying to edit the description of an Epic, User Story or Task it is impossible to reach a state where you can actually input text:

Meanwhile the console reports this error:

This makes Taiga entirely unusable.

How can we reproduce the behavior

1. Setup fresh instance of self-hosted Taiga-Docker
2. Create a new Epic/User Story/Task in a project
3. Select the new task for edit using Chromium-based browser
4. Click on the description panel

Workarounds

None known.

Screenshots

Taiga environment

Self hosted Taiga docker (latest)

Desktop (please complete the following information):

• OS: Linux/Debian
• Browser: Chromium (Vivaldi)
• Version: 6.8.1

Additional context