Along with 2023.4 beta came this issue. I have a dashboard with a single map card. When the dashboard config sets panel: true, the card is blank. When that line of config is removed, the card and data ere displayed - but as a masonary card.
I really like the full screen panel mode gives me.
Is it me?
Sorry to say, but probably yes… I have similar setup with map card configured as the only card in dashbord, that is set to panel mode and it works exactly as it was in previous versions of HA (and as expected).
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Have you tried clearing your web browser cache?
Came back to this later and it worked. Odd that it was happening in the IOS app as well as browser.
Thanks!