Epson have posted a patch for this at https://www.epson.co.uk/viewcon/corporatesite/products/mainunits/faq/8654/2784
Thank you Claire! This patch isn't included in the Epson Auto-Updater software yet, at least for my model (WF-3520). Also, even though it's the UK site, it worked for my US model. FYI, it also does not give any confirmation dialog when the patch is complete.
I can confirm your observations, and that the patch has solved the problem for me with the Epson Stylus SX235W being controlled from Win10 Pro v1803 b17134.345.