parent::submitForm() should be at the end. See Working with Configuration Forms.
You could also add a schema.
binnythomas created an issue. See original summary.
Issue #3108807 by binnythomas: Updating submit form and adding schema
Fixing issue tag to "ContributionWeekend2020“ as suggested on global event page.
Automatically closed - issue fixed for 2 weeks with no activity.
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binnythomas commentedComment #6
c-logemannFixing issue tag to "ContributionWeekend2020“ as suggested on global event page.