This causes all Image blocks to have no Border-radius. What I found was that the Toolset Image Block also uses the .wp-block-image selector, just like the default WordPress image block. Maybe WordPress updated this block?
The only way to get a border-radius is to switch to this default WordPress block and select 'Rounded', which makes it round. But a small border-radius for both blocks is impossible now. What to do?
Link to a page where the issue can be seen: hidden link