MailApp.sendEmail method doesn't get through to accounts with URL in the body - Message Blocked

I am working on Google Apps Script. I am trying to send email as follows:

function test_sendmail(){
  var subject = "subject";
  var body = "https://www.google.com/";
  var emailBody = body;
  var options = {
    htmlBody: body
  }

  var recipient = "XXXXXXXXX@gmail.com";

  MailApp.sendEmail(recipient, subject, emailBody, options);
}

"XXXXXXXXX@gmail.com"(email address A) is not valid, but it's only for showing you an example. I use a real email address in the GAS execution.

The GAS execution is run by another G-suite domain google account(email address B) by which account the code is written.

The email address A has editing rights to the spreadsheet that has the above code in the GAS editor.

But, the email from the above function doesn't get through the email address A. I got this email in the email address B.

LEARN MORE: https://support.google.com/mail/answer/6596?visit_id=637267406328019079-2003975007&rd=1

Then, I replace the email address with the email address B. and I tried to send it, and it did get through successfully.

Secondly, I changed the URL part:

var body = "https://www.google.com/";

to:

var body = "";

Then, the email successfully get through to both email addresses A and B.

The results listed as below:

The failure of sending email with URL to email address like the email address A has occurred recently like from 1 week or 2 weeks ago. Until then, the 4 cases had been successfully done before. I have no idea why this started happening recently.

I checked if the sender email address B is in the contact list of the recipient email address A.

It is not in my contacts.

But when I searched it, it appeared, so it seems in all contacts.

Added 1: I tried sending email to the email address C which is another G-suite mail address in the same domain as the email address B, but email address C doesn't have rights to the spreadsheet and the editor.

It sent to the email C successfully even it has no right to the spreadsheet.

Added 2: I tried sending email to the email address D which is other email address that is neither G-suite domain or @google.com address. The result is the same as the email address A.