Keyboard does not show up on GTK applications (Plasma Mobile)

Describe your issue

Maliit keyboard does not show up when focusing on a text input field of a GTK app

What's the expected behaviour?

Keyboard to open

How to reproduce your issue?

Open Firefox, try to enter a web address

What device are you using?

pine64-pinephone

On what postmarketOS version did you encounter the issue?

• edge (master branch)
• v21.03
• v20.05

On what environment did you encounter the issue?

Phone environments

• Phosh
• Plasma Mobile
• Sxmo

How did you get postmarketOS image?

• from https://images.postmarketos.org
• I built it using pmbootstrap
• It was preinstalled on my device

What's the build date of the image? (in yyyy-mm-dd format)

20210401

Additional information

Keyboard version:

• maliit-keyboard-2.0.0-r0
• maliit-framework-2.0.0-r0