GitHub user dosubot[bot] added a comment to the discussion: Weird behavior and 
errors in Alert&Reports with playwright.

<!-- Answer -->
This timeout means Playwright never saw the `.chart-container` element appear, 
which usually means the chart failed to render. Beyond the basics (Chromium 
present, correct flags, wait event set), common causes include: the chart or 
datasource is broken or slow, the chart is in a dashboard tab that isn’t 
visible by default, network issues between the worker and Superset, 
authentication/session problems for the screenshotting user, or resource 
constraints (CPU/memory) in Docker. 

To troubleshoot: manually open the chart URL in a browser to confirm it loads 
and `.chart-container` appears; check Superset server logs for errors at the 
time of failure; verify the screenshotting user has access; confirm network 
connectivity between containers; and monitor resource usage. You can also try 
increasing `SCREENSHOT_LOCATE_WAIT` and `SCREENSHOT_LOAD_WAIT` in your config 
if the chart is just slow to load 
[[1]](https://github.com/apache/superset/issues/33132) 
[[2]](https://github.com/apache/superset/issues/33602) 
[[3]](https://github.com/apache/superset/discussions/31464). 

If the chart is in a hidden tab or fails to render due to a backend or JS 
error, Playwright will always time out waiting for it 
[[4]](https://github.com/apache/superset/issues/33132).


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GitHub link: 
https://github.com/apache/superset/discussions/34297#discussioncomment-13875271

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