TypeError Failed To Fetch Product Page

Hello i’ve run into an issue that has proven tough to solve.

I’ve added quite a few custom options to the product page and a custom sort.
All in all it seems to work all around.

However on a few categories with some random filters activated i can trigger these errors when trying to fetch from the Product index:
The FetchEvent for “” resulted in a network error response: the promise was rejected.
Uncaught (in promise) TypeError: Failed to fetch

It only occurs in a production environment, i can remove a random parameter from the query and then it suddenly works and if i decode the url and fetch from it again then it works.

Example URL from my production

Same URL decode example

Any suggestions on how to further debug or any knowledge to a solution is very welcome.

Specs are VSF 1.11.2 & ES7.