What you are saying is very confusing… If that’s the case then how is it possible that in WordPress the “Pages”->”Cart” page (and its content so the blocks too) gets displayed in the selected WordPress language, eg: Czech?
Screenshot from the WordPress->Pages->Cart page content: https://1drv.ms/i/s!AlS_b7WxKhQRgso9qdNDK_JiFg1dBA?e=nF9V3o
and what it looks like in the store: https://1drv.ms/i/s!AlS_b7WxKhQRgso-nsjye3aMp3sz9w?e=e3cqlm
Surely if the block content is translated properly from the editor section it should display the same translated format in the store?
Furthermore neither Loco Translate or the TranslatePress plugins were able to fix this problem. In fact TranslatePress plugin was showing that 100% is translated…