Most recent volto installation 28/12 works okay when started with yarn start command. But when I run yarn build followed by yarn start:prod, the site is not rendered properly and in the command windows errors are appearing with a high speed. Ctrl-C helps here.
I had the impression that with a previous version this sequence worked.
As I am experimenting with Volto I can live with this.
When invoking the control panel I see also some property and language setting errors appearing in the command window. Again not an issue for me while playing with this Plone Volto combination.
The mixture of having pages created with Volto an Plone is still "weird". I installed some eea volto plugins. When using them (e.g. an upload of a picture plus nice text) and then move to state published gives some surprise when swapping back to classic Plone. Combining both edit modes will require good organisation, separation and discipline else a mess is around the corner.
With native Volto you can create very nice layouts using those eea plugins.