ISBAT see correct Stacked images ratios with the Blockbase theme

### Describe the bug:
When the Blockbase theme is active, the Stacked gallery's images appear squished in the published post.

### To reproduce:

2. Activate Blockbase theme - you'll need an active Gutenberg plugin for that
3. Start a new post
2. Add a Stacked gallery with some images
3. Make sure the `Fullwidth images` option is switched on
4. Preview/publish the post
5. See how the images' height is static, but the width dynamically changes along with the browser window distorting the ratios.

### Expected behavior:
To see the original image ratios in the published post.

### Screenshots:
| Block settings | Published page |
| ------------- | ------------- |
| | |

### Isolating the problem:

- [ ] This bug happens with no other plugins activated
- [ ] This bug happens with a default WordPress theme active
- [ ] This bug happens **without** the Gutenberg plugin active
- [x] I can reproduce this bug consistently using the steps above

### WordPress version:
5.8.2

### Gutenberg version:
12.1.0 (plugin active)