In the latest nightly build (Build ID: 20230223094032), the embedded calendars vanish as soon as you click the "print" or "save" button, but the resulting document has calendar content. Bug 1794265 has fixed the resulting PDF file. https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=59e3b94106e72692601180305317679290f3a963&tochange=d7103c5e7e0ca1c0b9d3e3194044040ba8e1f906
Bug 1800897 Comment 7 Edit History
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In the latest nightly build (Build ID: 20230223094032), the embedded calendars still vanish as soon as you click the "print" or "save" button, but the resulting document has calendar content. Bug 1794265 has fixed the resulting PDF file. https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=59e3b94106e72692601180305317679290f3a963&tochange=d7103c5e7e0ca1c0b9d3e3194044040ba8e1f906