When editing a page with Posts list block (<!-- wp:a8c/posts-list {"postsPerPage":2} /-->), I see this:

Note how the button is cut out.
Site gutenboardingdemo.home.blog and theme Maywood. Browser Firefox.
cc @Automattic/ajax
Dotcom Manage Janitor Rotation note Jun 17, 20
We looked at this during a pairing call and discovered that disabling flex-shrink for the button fixes the issue. @cpapazoglou will follow up on this and get a PR ready.
Dotcom Manage Janitor Rotation note Jun 18, 20
Fixed in #43426 and will be in FSE Release 1.11
Most helpful comment
Dotcom Manage Janitor Rotation note Jun 17, 20
We looked at this during a pairing call and discovered that disabling
flex-shrinkfor the button fixes the issue. @cpapazoglou will follow up on this and get a PR ready.