Override section summary causing undefined array key error

[David-Kettle]

• Add content to a topic section summary
• Add content to the summary override
• Save the changes

Error and debug code:

Warning: Undefined array key "overridesectionsummary" in /home/sitenameredacted/public_html/course/format/classes/base.php on line 1189
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Script /~sqaacademy/course/editsection.php mutated the session after it was closed: $SESSION->editedpages
line 791 of /lib/classes/session/manager.php: call to debugging()
line 159 of /lib/classes/shutdown_manager.php: call to core\session\manager::check_mutated_closed_session()
line ? of unknownfile: call to core_shutdown_manager::shutdown_handler()

Moodle Version 4.3.2+ (Build: 20240104)