Unicode character breaks email template editor

[zakdma]

Preconditions and environment

• Latest Magento version

Steps to reproduce

1. Go to admin area.
2. Open Marketing/Communications/Email Templates list
3. Click Add New Template button on the top-right corner
4. See email template editor opened
5. Select Magento_Sales/New Order template as a value for Template form field
6. Click Load Template button
7. Enter any name to Template Name field
8. Add unicode symbol U+1F447 (👇) at any place in Template Content editor. Screenshot: https://prnt.sc/bDnJ5BzxSQTM
9. Click Save Template button to save template
10. Open the saved template again to edit

Expected result

Template Content field contains all template text as saved previously

Actual result

Template Content field contains text only prior to the inserted unicode character 👇
All further text is truncated
Screenshot: https://prnt.sc/zF5HOkJokwDj

Additional information

No response

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @zakdma. Thank you for your report.
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[m2-assistant]

Hi @engcom-Bravo. Thank you for working on this issue.
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• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).
• 2. Verify that issue has a meaningful description and provides enough information to reproduce the issue.
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• 4. Verify that the issue is reproducible on 2.4-develop branch
  Details

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[engcom-Bravo]

Hi @zakdma,

Thanks for your reporting and collaboration.

We have verified the issue in Latest 2.4-develop instance and the issue is reproducible.Kindly refer the screenshots.

Template Content field contains text only prior to the inserted unicode character 👇 All further text is truncated.

Hence Confirming the issue.

Thanks.