Multi Dropdown - Input Data too big

I run into an issue where my dataset is too big (30k rows) such that when I try to assign unique values of a list to the dropdown options, I get an error saying:

options[138].value in Dropdown with ID "filter 1" is required but it was not provided.

To solve this, I subset my data into half the size, then the code seems to work perfectly with a multi drop-down. Has anyone run into this issue?

I have been using the multi drop down with > 100.000 rows. Apart from increased loading time, I have experienced no issues with large amounts of rows.