Polymer is deprecating - possible button-card related errors in log?

[pejotigrek]

Checklist

• [X] I updated the card to the latest version available
• [X] I cleared the cache of my browser

Describe the bug I'm heavily editing my button-card based dashboard right now, and while refreshing the view to see my changes, there are random errors in homeassistant's log:

2023-04-13 16:37:08.224 WARNING (MainThread) [frontend.js.latest.202304110] WARNING: Polymer will be removed from window in Home Assistant 2023.5. More info: https://developers.home-assistant.io/blog/2023/04/04/deprecating_polymer

I am not totally sure if this is button-card related [error in the log is slightly unprecise...] but I've searched button-card repository for Polymer keyword, and found few matches in the code, so the question is - should we all be worried and not update HA to 2023.5 when it shows up?

Version of the card Version: 3.5.0

Expected behavior No errors in the log

Desktop (please complete the following information):

• Browser: Chrome
• Version 112.0.5615.87

[Mariusthvdb]

This is totally Not custom:button-card....

Please close..

[pejotigrek]

This is totally Not custom:button-card....

just to be sure - I've found this that's why I thought it can be related.

[Mariusthvdb]

Sure, those are copyright mentions.

Not actual code usage.

Before raising issues please always disable all custom cards except the one you are actually debugging.

If the warning still occurs you might have a valid contender ;-)