Problem
Some themes do not handle "line item properties" correctly, which can result in technical line item properties to be visible, when they should be hidden.
Example:
Solution
The solution requires a small modification to your theme.
This modification requires:
technical skills
a good understanding of the liquid files in your theme
Step 1: find your (drawer) cart liquid file
Locate the liquid file where your cart or drawer cart is implemented.
Step 2: locate the loop where properties are rendered
Look for a for loop similar to this:
{%- for p in item.properties -%}
... code that renders properties...
{%- endfor -%}
Step 3: add code inside the loop
Shopify themes should ignore technical line item properties.
Line item properties have a key and a value.
Technical line item properties have an empty value.
So we need to add an unless/endunless block inside the loop:
{%- for p in item.properties -%}
{%- unless p.last == blank -%}
... code that renders properties...
{%- endunless -%}
{%- endfor -%}