Default parameters with Flow webhooks don't seem to work the same way as with Script Webhooks

[phantomato]

I might be missing something, but it seems like there's no way to have Flow webhooks respect the script's default parameters.

Given this simple script u/admin2/tsscript with a default parameter, I'd like to demonstrate a discrepancy between two cases.

Case A: A simple script webhook triggered with and without body parameters:

With body

The function's default x parameter was overridden from the webhook's body as expected.

Without body

Without the body, the function's default "some cool default value" was used, which was also expected.

Case B: A new Flow is being created connecting its input input variable with the tsscripts x variable.

The input variable is nullable, so it doesn't get converted into an empty string.

Running the Flow webhook with the body

The variable gets overridden as expected.

Running the Flow webhook without the body

Instead of using the tsscript's default x value as in Case A it's now being interpreted as null.

To summarize this, Case A interprets missing variables as undefined and lets Typescript use it's default values, where
Case B interprets missing values as null, making Typescript's default values useless.
Is there any way I can trigger Flow webhooks while keeping Typescripts? default values?

Thanks!