[Cloud] Problem with multiselect customer attributes

[github-jira-sync-bot]

ISSUE
Problem with multi-select attribute.

STEPS TO REPRODUCE

1. Create a new multi-select customer attribute by setting few options(enable values required to Yes and show on storefront to Yes, set < Customer registration ] form )
2. Load the customer registration form from the frontend

EXPECTED RESULT
Customer registration form load without any issue.

ACTUAL RESULT
Customer registration doesn't load. The following error triggered in exception log.

[2023-03-05T05:57:40.032602+00:00> report.CRITICAL: Exception: Deprecated Functionality: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /magento2ee/app/code/Magento/CustomAttributeManagement/Block/Form/Renderer/Multiselect.php on line 53 in /lib/internal/Magento/Framework/App/ErrorHandler.php:62

[github-jira-sync-bot]

The issue was exported from the internal Jira. The link to the original Jira issue: https://jira.corp.adobe.com/browse/ACP2E-1717

[m2-assistant]

Hi @github-jira-sync-bot. Thank you for your report.
To speed up processing of this issue, make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, Add a comment to the issue:

• @magento give me 2.4-develop instance - upcoming 2.4.x release
• For more details, review the Magento Contributor Assistant documentation.
• Add a comment to assign the issue: @magento I am working on this
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[chittima]

Internal team is working on this issue