TypeError: strlen(): Argument #1 ($string) must be of type string

Problem/Motivation

I am getting below error on user edit pages and content edit pages after upgrading to bootstrap 5

TypeError: strlen(): Argument #1 ($string) must be of type string, array given in strlen() (line 395 of /core/lib/Drupal/Component/Utility/Unicode.php).

Similar error was fixed in bootstrap using https://www.drupal.org/files/issues/2024-01-22/bootstrap-error_when_form... →

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API changes

Data model changes