Transformed blocked messages not showing correctly

[gsproston-scottlogic]

Bug report

Description

If a user message is both transformed and blocked, then the transformed message will not show at all after a refresh or after switching levels.

Reproduction steps

Steps to reproduce the behaviour:

1. Go to sandbox mode
2. Activate XML tagging
3. Activate character limit defence
4. Send a long chat message which will trigger the character limit defence
5. Wait for the reply
6. See that there's the original user message, the transformed user message, and the bot blocked message
7. Refresh the page OR switch levels
8. No transformed message

Expected behaviour

The transformed message is still shown after the refresh or switching levels.

Screenshots

Before refreshing or switching levels:

After:

Software (please complete the following information):

• Browser: Edge

Additional context

Could be related to #741

Acceptance criteria

GIVEN a message has been transformed (e.g. the user activates xml tagging and sends a message)
AND blocked
WHEN the page is refreshed
THEN the transformed message is still shown (below the original message)

GIVEN a message has been transformed (e.g. the user activates xml tagging and sends a message)
AND blocked
WHEN the user switches level and then back to the original level
THEN the transformed message is still shown (below the original message)

[chriswilty]

Think this is still a problem after #705

[pmarsh-scottlogic]

moving this to in review, because I've accidentally found and fixed it in #803