Platform, device version and operating system:
ps5, though I expect it’s the same evrywhere
Screenshot or image:
The first 2 images show random examples of the enemy teams I’ve been presented with in the currently Green PvP battle kingdom of Aidania.
The 3rd image is my current stats there.
What you were expecting to happen, and what actually happened:
I was expecting to get offered genuine teams that players had set/used. Instead, all 48 battles in this kingdom so far have been against collections of 4 random green troops that rarely make sense as a team and have not once included a hero/weapon and therefore class.
At first I assumed this was likely down to the region not being properly populated yet, but it’s getting on for 24 hours since the update and I’ve still yet to see a real team here.
I have 48 wins here using the exact same team of Wand/Bee/Bee/Lep. As that’s the team I’ve used, and from within the first 15 minutes of the patch going live/being installed, I’d have expected this would be my defence team given what I’ve read. Instead, I believe those 38 defence losses and 0 win were against my account name but not against my team, just any 4 random green troops.
Taking this one step further, you can look at the global leaderboard (it’s a little messy due to not being reset before the update, but there’s still some worthwhile numbers to take note of) where it can be seen that there are decent players with very strong accounts but have the kind of defence loss numbers they might only see in a season, never mind less than a single day (plus a few days pre-patch). Example of which: SHEFFIELD with 650 defence losses last time I looked - in my mind, that’s because it’s a high level account worth a lot of points by defeating and the defence team being random junk makes it an especially worthwhile target. I know their usual defence team/s and I know well enough to stay the heck away 
My team is decent enough as an attack/defence hybrid, so I’d expect to have at least scraped a few wins by now… 0/40 on defence is entirely possible, but I dunno if I could beat that team 40 and 0 and strongly suspect my defence team has been something entirely, randomly different along with everyone else’s.
How often does this happen? When did it begin happening?
Steps to make it happen again
Every time the 3 sets of opponents eventually load up, they are all, always, 4x random green troops and not teams set by players with no hero/weapons to be seen.
exactly