Hello
I am also affected by this issue.
This morning I started an upgrade process from wampserver 3.1.0x64 + apache 2.4.27 to the current wampserver 3.1.9x64 with apache 2.4.39. I need to use PHP 7.2 so I would like to update wampserver.
With wampserver 3.1.0x64 + apache 2.4.27 I was able to see my SSL enabled website using my WAN IP on the router side.
Using wampserver 3.1.9x64 wit
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