NSFW channels pinning in unread

Checklist

• I am reporting an issue in existing functionality that does not work as intended
• I've searched for existing GitHub issues

Description

Now, when folders finally arrived, I took advantage of it and it's pretty nice.
Besides just one little thing.
I have a channel considered to be "NSFW" on iOS(works okay with desktops),
which from time to time obviously has new posts. Thus it gets into my "Unread" folder.
Once instead of swiping to mark it as "read"(since I can't read it anyway thanks to Apple),
I managed to press "Pin" button instead. No big deal I thought, but unpinning it actually keeps it in the folder anyway.
All the time. And on desktop it isn't shown in the folder if it is "read".
That's pretty annoying.

Expected Behavior

Any pinned channel in "Unread" folder can be unpinned which leads to its disappearance from the folder until unread messages arrive again(if there's none).

Actual Behavior

I believe that non-NSFW channels work fine,
but NSFW definitely got stuck without any proper way of resolving the issue

Steps to Reproduce

1. Join via another platform any channel that is considered as NSFW by Apple
2. Wait for new messages on it
3. On iOS client went to "Unread" folder
4. Pin the NSFW channel
5. Unpin it
6. Read the channel by swipe action

Environment

Device: iPhone SE(1st generation)

iOS version: 14.0.1

App version: 7.2

Start by reproducing the issue through the Unread folder and the channel pin/unpin flow on the stated iPhone SE and iOS 14.0.1 environment. Trace how unread status and pinned state are combined for NSFW channels, then verify that unpinning and reading the channel removes it until new messages arrive.