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The table summary attribute is a deprecated tag (https://www.w3schools.com/tags/att_table_summary.asp) that is not recommended by WebAIM (https://webaim.org/techniques/tables/data), but the CKEditor _Table Properties_ dialog allows you to add one.
If you add a Summary in this dialog, Antisamy nukes it on save.
The option should be disabled in _Table Properties_.
The table summary attribute is a deprecated tag (https://www.w3schools.com/tags/att_table_summary.asp) that is not recommended by WebAIM (https://webaim.org/techniques/tables/data), but the CKEditor _Table Properties_ dialog allows you to add one.
If you add a Summary in this dialog, Antisamy nukes it on save.
The option should be disabled in _Table Properties_.