ISBAT use Masonry block and have consistent layout across browsers

### Describe the bug:

It seems that Safari is displaying an inconsistent masonry layout compared to Chrome and Firefox. In the screenshots provided, we can see superfluous spacing that resides above the middle image.

### To reproduce:

1. Add Masonry block.
2. Add images with varying heights (easier to see with more images).
3. Publish and view the page in Safari.

### Expected behavior:

Expect consistent Masonry layout in Chrome, Firefox, and Safari.

### Screenshots:


### Isolating the problem:

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

### WordPress version:

5.9

### Gutenberg version:

N/A