Gigapixel 8 Redefine takes forever even rendering preview (on 1x)

Hello,
I have the following problem that Gigapixel 8 takes ages to render even when it is set to x 1 (upscale). So a preview is not possible at first, when I click on Export Image, Gigapixel 8 turns a 200 KB file into a 200 MB file. I have already waited over 2 hours and nothing has happened.

My computer:
Ryzen 7 5700X
32 GB RAM
Radeon RX 6800 XT

What is the problem?!
preview

The other modus “recover” works very fast with rendering preview. But redefine is a slow machine.

I can’t even test it on cloud service, since you didnt gave me the 200 credits from black friday offer…