Unit field do not auto updating when product changes inside the repeater (dependent select issue)

Package

Form builder

Package Version

How can we help you?

I'm facing a small but confusing issue when using a Repeater with a dependent Select field for units that depend on the selected product.

When I first select a product, the unit field correctly auto-selects the first available unit, and it works perfectly.
However, when I change the product to another one, the unit list updates successfully (showing the correct new options), but the selected unit does not reset — it still keeps the old product’s unit selected.

The "sale_price" updates correctly when the product changes, but the unit itself stays stuck with the previous one unless I manually select it again.

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Expected Behavior

- When I change the product, the unit field should automatically update to the first available unit of the newly selected product (just like it does on the first selection).

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Actual Behavior

- The unit dropdown options refresh successfully with the new product’s units.
- The unit value does not change — it stays set to the previous unit.
- The "sale_price" updates correctly, which means the code logic runs, but "$set('unit_id', $first['unit_id'])" seems not to take effect when product changes.

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Code

Here’s the simplified version of my Repeater setup (full working logic below):
GitHub Gist: https://gist.github.com/7498f02758331ddb586509d27201c69b.git

Question

Is this the expected behavior (perhaps Filament prevents overwriting user-modified fields)?
If not, what’s the recommended way to reset a dependent Select field’s value when another field changes inside a Repeater?

Any help or insight would be really appreciated