Hello. Please clarify your question. I'm using justified gallery 19 in WebSite X5 2023.2.6 (latest stable version). It seems everything is fine.

I've been using 2022.3.4 pro. it has justified gallery v18 installed. I've been using JG for years. the last few times I've added an image, to the middle of an excising list, in justified gallery, there was a bug. on the website, the new image did appear correctly on the page, but when I click on the new image, the following image would come up (not the newly added image).

so I installed wsx5_pro_v2022.3.7.exe. I installed the justified gallery object, and got v19. I then open my project, go to the page with the justified gallery object, and it has no description field option.
by the way, when exported, the previously created descriptions do appear on the website.

as a test, I just started a new project, and was unable to drag justified gallery on to the page. it didn't have an icon and wouldn't move. so I uninstalled and reinstalled justified gallery. I was then able to add it to a new page.
the description field was still missing on the empty test project.

As far as I know, at the moment version 2022.3 is not the final stable release. This is a test version. Not for work sites.
I sent a notification about your question to the company employees, expect an answer from them here in the comments.

https://helpcenter.websitex5.com/fr/post/260251

Hello V.K

We've found the error you mentioned and restored the Description button.

To get it back for new Objects, simply uninstall the Object in Step 4 -> Object Management and install it again.

Objects should then display the option again

I remain available here

Stefano