Still a problem, and affecting other operating systems and Fitbit models, not just Android and the Charge watch.
I use a Fitbit Inspire HR (with latest firmware update) and an iPhone SE (2020) running the current version of the Fitbit app and I, too, see my rest and move intervals switched in the report in the phone app.
Apart from joining the ever-increasing chorus of voices pleading with Fitbit to fix this, some observations:
1. The Fitbit itself has no problem: in terms of buzzing at me to cue change of pace, it presents the interval segments in the correct order and duration as I have them set up in the Fitbit app on my phone.
2. The activity report in the phone app is where the problem emerges. The "Type" column switches the labels, so that Move is labelled Rest and vice versa.
3. The report on the online Fitbit dashboard is basically fine, mainly because it doesn't attempt to label the interval segments/splits, it just numbers them and provides the (correct duration). For the short term, viewing reports online in a browser is going to be less frustrating than viewing them on your phone. (Also a bit more detailed.)
