Import WordPress test data from Theme unit test data page
Edit "Block: Gallery" post
Right click and Inspect element
Go to console
Can see this error
Block validation: Block validation failed for core/spacer ({name: "core/spacer", title: "Spacer", description: "Add white space between blocks and customize its height.", icon: {…}, category: "layout", …}).
Please follow these steps
Import WordPress test data from Theme unit test data page Edit "Block: Gallery" post Right click and Inspect element Go to console Can see this error Block validation: Block validation failed for core/spacer ({name: "core/spacer", title: "Spacer", description: "Add white space between blocks and customize its height.", icon: {…}, category: "layout", …}).