JSON validation fails for code meta which can be null

[kptdobe]

[hlx] warn: tapping failed: Error: Invalid Context at step 2
data.content.mdast.children[9].meta should be string undefined, data.content.mdast.children[11].meta should be string undefined, data.content.mdast.children[13].meta should be string undefined, data.content.mdast.children[15].meta should be string undefined

meta property of the code block is null.