O macOS Move 10.14.6 went through five beta versions before being released to the general public last week. Well, apparently the tests weren't enough.
That's because today Apple made the MacOS Mojave 10.14.6 Supplemental Update for Mac owners compatible with Ma's latest operating system. According to the company, the update fixes an issue that could prevent certain Macs (without specifying which ones) from waking properly from sleep.
The update can now be downloaded / installed from the Software Update panel within System Preferences.