A user is reporting the same problem I've seen a while ago, see here. It seems a unique problem with this property.
Description
Description
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Related Objects
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the property is still in the wb_entity_per_page table, which is probably is the reason for this bug.
i vaguely remember that we once had a bug about not removing properties from the table. we can probably manually fix this.
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T73914 was the bug that caused deletion updates not to be applied for properties. I see the property also still in the wb_terms which might be the actual issue for the suggestions.
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manually purged these from the database tables. i think the issue should be fixed now, but please check.