1. In worksheet, fill column A with 32 rows data, column B with 5 rows data.

2. Set column C formula as A[i].
   ==> Only 5 rows fills with result.

3. Modify data value in column A and recalculate.
   --> Result fill with 32 rows.

Now when using the [i] notation, result column range will map to the bound of the 1st input range.

Fixed in Origin 2025b.