Possible same issue: Cookies issue while embedding kibana dashboard with iFrame

On an embedded, iframed Kibana, the user cannot login on Safari nor Chrome. Opening up the fullscreen dashboard in a separate tab, where Kibana is not iframed, allows the user to login on first try.
Browsers Affected: Chrome (latest), Safari 13
ELK version: 7.4
Are there any workarounds that don't include upgrading to 7.8.1 (where feature is fixed)?
Thank you in advance for any information you can provide.
Benjamin Chen