When searching or updating a certificate while the keyserver or WKD is not available (for testing network connection was turned off) I would expect an error message informing about network (or server) being not available.
Instead the query returns for WKD always "The certificate was not found." and for keyserver it varies, here "Server indicated a failure" (on a previous 5.0 Beta version and Gpg4win 4.4.0):
{F22744508}
On Gpg4win-5.0.0-beta190 the error is "Unknown error" instead:
{F23113171}
I would expect some kind of "service not available" message. Probably for both queries "Update failed: Server is not available."
The user then can check their internet connection or try again later, if the cause is that server is down at the moment.
Might have synergies with T7616.