The sanitize of the save method and the convert to method interfere with each other

[chf-gh]

The format required by the block save method:

static get sanitize(){
	return {
		url: false,
		caption: {
                     a: true
                 }
	}
}

The outermost object returned is a property, not a label.
convent to also uses this method, but it passes the result directly as a rule to and HTMLJanitor, as shown in the following figure

which causes the cleanup to fail.
Also, I noticed that even with the sanitize method configured, the save method still didn't clean up the data.