Incidents are sometimes failing to start with slash command and RHS

Description

Test server: http://wf-test-te.test.mattermost.cloud/
Incident Response plugin v0.1.0

Trying to start an incident with `/incident start`and in RHS is failing from certain channels. However, once an incident is started using the post menu in the same channels, incidents get started successfully with the slash command and RHS.
(See attached video)

QA Test Steps

See description.

Mana

None

Assignee

Christopher Poile

QA Assignee

Prapti Shrestha

Reporter

Prapti Shrestha

Epic Link

None

Fix versions

Mattermost Team

Workflows

Sprint

None

QA Testing Areas

Workflows

GitHub Issue

None

Components

Severity

None
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