Loading page Puppet not working propperly

When I configure Puppet to take a screenshot, it shows that my calendar card doesn’t load properly.
This issue only occurs with external calendar cards — the built-in calendar card works fine.
I’ve tried both the Atomic Calendar Card and the Calendar Card Pro, and they both show the same problem.
Adding a waiting time to the URL does not solve the issue:
http://192.168.1.168:10000/dashboard-display?viewport=800x480&eink=2&wait=10000

Does anyone have an idea how to make it work?

i use this for a E-ink display

Disable keep_browser_open solved issue.