Featured Images are randomly failing to render when Post Template is Grid

[jeflopodev]

Description

Those featured images are randomly failing to render on page refresh, they're are loaded, because when I zoom-in or zoom-out pressing CTRL++ or CTRL+- they are then rendered visible...

Please check the video below. In the video I used Chrome but I also tried on Vivaldi:

Seems to happen only when the template post is set to Grid, at least for me.

Since here #49280 you both are talking about the need for a query pattern of a grid of featured images.
I thought you could be interested: @annezazu @richtabor

Can you guys repro this ?

I tried enabling WP_DEBUG and I don't see errors in the page or in the console (devtools).

I went through 10 pages of existing issues 😅
And I've found other about the featured images failing to load in the admin & preferences pages #55460
But this is on the front-end... I don't think it's the same problem, therefore, I create a new issue.

Step-by-step reproduction instructions

1. Create Posts with Featured Images (added from sidebar)
2. Create a Query Loop on a Page and set the post template to Grid
3. Save, Publish & Load the page
4. Check if after reloading some featured images are not visible.
5. Check if after Zooming in and out (CTRL++ or CTRL+-) the featured images get rendered.

Screenshots, screen recording, code snippet

> 10MB so I'm uploading it to YT
https://www.youtube.com/watch?v=DuPnYzxJsTQ

Environment info

WordPress 6.6.2
Gutenberg 19.3.0
Chrome 129.0.6668.60 (Oficial Build) (64 bits)
Vivaldi 6.9.3447.48 (Stable channel) (64 bits)
Windows 11 23H2

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes