Webhook on not proposed properties not working

Hello,
I’ve created a webhook to detect property changes on a property that isn’t listed in the drop-down list that appears when you have to choose the property to listen to.

The webhook is on the Company entity, and the property is hs_merged_object_ids.

If I try to merge a company (so the property hs_merged_object_ids changes), I don’t receive any calls on the webhook, as you can see in the figure (count 0).

Does the webhook work for HubSpot properties not listed in the drop-down list?