Basically the latest drivers won't see a monitor if it's been driven by an eGPU in MacOS Mojave.
6.3.30-2 is the latest driver that that works with eGPUs.
Please Wacom.
News 20.07.2020:
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Wacom Customer Support page: https://support.wacom.com/
Wacom Product Resources - Drivers, Manuals, Warranty Information & Others
Mac OS 10.15 Catalina Support:
https://www.wacom.com/en-de/support?guideId=015-916
Mac OS 10.15.4 Update:
What does the Mac OS warning message “Legacy System Extension” mean and why am I seeing it?
eStore Shipping
Please note that reduced UPS service might affect your region due to CoVid-19 situation. See updated details for UPS serviceshttps://www.ups.com/de/en/service-alerts.page?id=alert1
Product Registration:
Please register our products on https://www.wacom.com/register
How do I register my Wacom device?
Dear customer, due to cookie policies we cannot allow embedding pictures from 3rd party sites any more.
In case you want to show our support teams a picture, open a case at http://www.wacom.com/support/contact-support
Thanks for your understanding.
Wacom Customer Support page: https://support.wacom.com/
Wacom Product Resources - Drivers, Manuals, Warranty Information & Others
Mac OS 10.15 Catalina Support:
https://www.wacom.com/en-de/support?guideId=015-916
Mac OS 10.15.4 Update:
What does the Mac OS warning message “Legacy System Extension” mean and why am I seeing it?
eStore Shipping
Please note that reduced UPS service might affect your region due to CoVid-19 situation. See updated details for UPS serviceshttps://www.ups.com/de/en/service-alerts.page?id=alert1
Product Registration:
Please register our products on https://www.wacom.com/register
How do I register my Wacom device?