We have started the process of switching from Classic to Lightning Experience. I have come across an issue where Chatter feed on Skuid detail page is appearing in Classic and not Lightning, we are missing all new LE features. Has anyone experienced this and knows any possible solution?
There is a known issue affecting Skuid in Lightning that currently prevents Chatter feeds from loading in a Page Include. There was another issue affecting Chatter in Skuid pages that was resolved in the most recent maintenance release, 11.1.13. If you're not updated to that version, I'd recommend testing it thoroughly in a non-critical sandbox, and moving to that version.
As an alternative, the Chatter feed can also easily be brought into the Lightning App Builder as its own native Lightning component, running alongside your Skuid page.