Canonical URL override works for HTTP header but not HTML <link> tag

[Mathew-WD]

Plugin version: 5.0.0
Craft version: 5.x

Setting a canonical URL override in the SEO field Advanced tab on an entry outputs the correct URL in the HTTP Link: header, but the tag in the HTML still outputs the current request URL including query string.

To reproduce:
Create an entry at /product-enquiry
In the SEO field → Advanced tab, set canonical override to https://yoursite.com/product-enquiry
Visit https://yoursite.com/product-enquiry?product=abc
Check HTTP headers — Link: header correctly shows https://yoursite.com/product-enquiry
Check page source — shows https://yoursite.com/product-enquiry?product=abc

Expected behaviour:
Both the HTTP header and the HTML tag should reflect the canonical override.
Actual behaviour
The HTTP header honours the override. The HTML tag ignores it and outputs the parameterised URL instead.