SecurityError: Sandbox access violation, safari

[danCMedicus]

Can't print in safari Version 18.5 (20621.2.5.11.8), latest as of now.

SecurityError: Sandbox access violation: Blocked a frame at "https://staging.england.medicus.health" from accessing a cross-origin frame. The frame being accessed is sandboxed and lacks the "allow-same-origin" flag

Our URL is the same https://my.url.com

Works in Chrome and code generated is -

<iframe style="visibility: hidden; height: 0; width: 0; position: absolute; border: 0" id="printJS" src="blob:https://my.url.com/9e5d2c29-863e-45fc-b4ff-ec25d52b04c1"></iframe>

our code

printJS({
  printable: url,
  type: "pdf",

  onError: rej,
  onPrintDialogClose: res,
});

How can we add the required attributes ? Suggested required are -
sandbox="allow-same-origin allow-scripts allow-forms allow-popups"