iOS Slack app - Threads stuck bold / unread

I have followed Slack's instructions to clear unread messages and still "Threads" is bold in my Slack app. It is not bold on my desktop app. [Slack's instructions](https://slack.com/help/articles/360001559367-Troubleshoot-Slack-notifications#mac-5) : > **Mark everything as read on desktop** > - From the Slack desktop app, open the affected workspace. > - Press Shift + Esc. > > **Clear the Slack app cache** > - Tap "You" at the bottom of your screen. > - Tap Preferences. > - Tap Advanced. > - Tap Reset Cache. > > **Clear app data from your device settings** In addition to clearing the Slack app cache, you can also clear the app data from your device. > > - Open Settings on your device. > - Scroll down to Slack in the list of apps. > - Tap the toggle next to Reset Cache on Next Launch. > - Open the app to reset the cache. > Note: This will log you out of all workspaces you're signed in to. This third step did NOT log me out of my workspaces FWIW.