Webhooks: double POST on specific activities, updated/created action confusion

I am not marking this as a bug as this might just be me not understanding how Plane behaves.

A) Double Payloads

If I update an existing work item changing it from In Progress to Done, I get two payloads.

1. action: "updated" activity.field: "state"
2. action: "updated" activity.field: "state_id"

This makes sense to me, it's basically saying "I've updated state" and "I've updated state_id".
The same happens for labels/label_ids, assignees/assignee_ids.

Now this is where I am struggling:

If I assign a Start Date to an issue, I also get two payloads, but they are exactly the same (only with a slightly different timestamp).

1. action: "updated" activity.field: "start_date"
2. action: "updated" activity.field: "start_date"

The same exact thing happens with target_date as well as priority.

Example

This seems to be a bug, but I am not fully sure and would love to get some guidance.

B) Created/Updated action confusion

When I assign priority/labels/etc to an existing Work Item, I get those in form of action: "updated".
When I assign a Module to an existing Work Item, I get this in form of action: "created"

The same exact thing happens when assigning Cycles.

I find this very confusing. Why is it not considered an updated action? Is the work item somehow duplicated in the backend when it is assigned to Modules / Cycles?

I also find this very confusing/inconsistent but I might just be missing some context.

Would love some guidance here as well.

Thank you