Friends of Friends & Friends Worlds don't appear on worlds tab, I’m unsure if this was a simple error or bug but I tried a couple of things and nothing seemed to make it work, I even made the slightly dumb(risky) choice to reinstall minecraft and it fixed nothing except for having to resetup the settings and redownload my worlds that I saved. There wasn’t any steps from what I could tell to reproduce the issue so I’m sorry about that.
The screenshot provided is suppost to repersent the issue, even if there isn’t anything showing I have friends online but trust me I do.
Can confirm this issue is also on my PC. All my friends of friends and friends worlds on my PS4 appear on the world tab but not on my PC.