That’s too bad. If someone has this same problem there is a slightly hacky manual solution I came up:
1. Edit Gutenberg Gallery block in HTML
2. Copy “data-id” numbers from HTML code
3. Paste them into shortcode as ids: [gallery link="file" ids="101,102" soliloquy="true"]
4. Add shortcode block
5. Remove Gutenberg Gallery block
Works, but you need to this to every gallery by hand.
Thank you for your answer. I will change desktop images to cover block for now.
However, I would prefer using images as there is no way (that I know of) to control the vertical cropping of the cover block. Also using images as an element background remove them from standard browser UX, search engines and some social media platforms.
Using image specific CSS-rules is not very good practice in the long run, as every time we use wide align we would have to add more styles. Would prefer it to work as it is supposed to.
The theme is updated, Gutenberg is up to date.