I came here to ask the same thing. I made a community, made a few starter posts and also a lemmy support post, I can see all my comments and can see on my profile that I have made 9 posts all in all, but can't see any of them (it's the same on Connect, Jerboa and browser). I can still access posts I have made comments on through the comments on my profile, but they don't show up either on my profile or on the community I created.
Edit: I also just made a new test post on my own community and that also doesn't show up anywhere (though it added the post to the total number of posts I made on my profile).