GitHub user HerveBr added a comment to the discussion: Generating screenshots 
(thumbnails, PDFs, and images) is causing problems for certain tables and charts

The solution doesn't seem to be in the 4 points you mention:

1) ENABLE_DASHBOARD_SCREENSHOT_ENDPOINTS and 
ENABLE_DASHBOARD_DOWNLOAD_WEBDRIVER_SCREENSHOT -> True
2) SCREENSHOT_LOCATE_WAIT = 600 and SCREENSHOT_LOAD_WAIT = 900
3) Playwright used. Chromium and Playwright are present in my Docker image
4) Regarding tabbed dashboards, I used to be able to see the first tab as 
thumbnails. Now I can't. Regarding the PDF or image creation process stopping, 
it happens when printing dashboards with or without tabs.

I recreated some charts from scratch that didn't have thumbnails. Some of them 
recreated one, but others didn't.

If a dashboard only includes charts that can have thumbnails, then a PDF or 
image can be created for that dashboard. If a dashboard includes at least one 
chart that does not generate a thumbnail, the dashboard cannot be exported to 
PDF or image.

You think the only solution would be to fix the code to increase the 
"soft_time_limit" ?

The strange thing is that before the upgrade from version 4.1.2 to version 
5.0.0, all thumbnails and PDF and image creation worked.

GitHub link: 
https://github.com/apache/superset/discussions/34685#discussioncomment-14102710

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