Don't worry, this is a totally normal and planned! Everyone can share a weet in a private channel.
Private channels simply block anyone from viewing those weets unless the user is a member of that private channel.
Related Resources:
Why are the names of my Channels changing?
Why do I have to reset my password, even though I know my credentials are correct?
What happens when my team or I hit the 10 video limit on the Free plan?
How do I create custom virtual backgrounds for my camera?
What is the difference between a work and personal Workspace?
What is a Workspace and how do I create one?