RN Android: Mentions not updated on mobile while channel sidebar is open

Description

Steps:
1. On your mobile device, open channel sidebar
2. Have another user DM you

Observed: DM channel doesn't appear as an unread mention, until you close then reopen the sidebar
Expected: DM channel appears as an unread mention

Mobile view (no DM from Jason on list):


Desktop view (DM from Jason on list)

QA Test Steps

None

Status

Mana

None

Assignee

Unassigned

QA Assignee

None

Reporter

Jason Blais

Epic Link

None

Fix versions

None

Mattermost Team

Unassigned

Sprint

None

Labels

None

QA Testing Areas

None

GitHub Issue

None
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