I have Joomla "Force HTTPS" off ( same with log in modules, https also off) - and no ill effects here whatsoever ( Paypal payments still coming in fine via CBSubs)
You should be able to turn that back on if you want to force https.
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I am on PHP 5.6.31 - not all modules in my site allow PHP 7.x yet.
However, 3.8.5 seems to do the trick. I will test one more day before upgrading. Minimum my mirror pages seem to be working well. Maybe important to say: My pages are multilingual.