There is currently an issue with latest nodered/node-red-docker:rpi-v8
docker image which might give problems.
This problem typically appears when you have recently redeployed this application because the balena build machine will detect that there is new build version available and build against that version.
Moreover when going back to previous version = nodered/node-red-docker:0.20.7-rpi-v8
you might encounter issues when using latest node-red-dashboard
version.
For more information see https://discourse.nodered.org/t/node-red-dashboard-ui-button-syntaxerror-unexpected-token/15844 (it also mentions a solution).