groues

Yes, same thing on my side after update to 2021.6.0 

After investigation, this seems to be linked to the upgrade to Lit 2.0: https://developers.home-assistant.io/blog/2021/05/19/lit-2.0/ I have changed the header of the /home-card/home-card.js as follows and it seems to have done...

Actually, I have kept the './themes.js' in the home-card.js My frontend skills are close to none but from the 2021.6 breaking change notes I noticed that LitElement and lit-html have...

Works fine on my side but I had to restart HA and clear my browser's cache first. Thanks for the good work BTW :)