The design of widgets has changed

Question

I'm working on apps script gmail add-on. Today the design of addon has suddenly changed. All widgets look different. Sometimes it seems like the styles are not loaded. No mentions about any design changes in google documentation. For comparison I opened different add-on's in different browsers, workspaces and gadgets. Here is summary:

1. Add-ons in mobile versions have familiar design (as shown in guide)
2. Add-ons in calendar workspace also have old design.
3. All add-ons in gmail workspace have changed design in different browsers (Chrome, Safari)

Here is screen-shotenter image description here example of 2 views of one addon (1 - new view; 2 - old familiar ):

Tried to logout, reload. No changes.

Answer 1

It looks like the Google team has already documented the new widget design. Now it is clear that the UI in the Addon needs to be remade, the appearance of widgets will not remain the same.