If you are having this issue with latest Pock (0.8.1-5), you can follow instructions in this post to resolve it.
TL;DR: Downgrade the Dock widget to default version, drag it to Touch Bar and upgrade it to latest.
Downgrade the Dock widget
- Download the default version of Dock widget here.
- Unzip & Drag it to Install Widget popup from Pock.
Drag the Dock widget to Touch Bar
Upgrade the Dock widget to latest