After update to CoBlocks 2.21.5 (in WordPress 5.9), still more bugs:
On a page with multiple carousels, only the first one works with arrow navigation in Firefox or Safari on Mac, iPad and iPhone.
Responsive Height leaves a LOT of (vertical) space between carousels. However with Responsive Heights, if you click on one in Safari on a Mac, you can get one of them to popup and work; if you double-tap on an iPad same thing, but you have to tell people to do that.
Specific heights look fine in Firefox and Safari on a Mac or iPad, but on an iPhone they show LOTS of space above and below carousels. It is also trial and error with specific heights to figure out which one works best.
Also cannot move pictures around in the galleries.
Hope this helps.