URL Routing is missing for certifications

Steps to reproduce

1. Navigate to https://typo3.org.ddev.site/certification/integrator/certified-integrator-listing
2. Click at B

Example URL

https://typo3.org.ddev.site/certification/integrator/certified-integrator-listing?tx_certifications_certlist%5Baction%5D=list&tx_certifications_certlist%5Bchar%5D=B&tx_certifications_certlist%5Bcontroller%5D=Listing&cHash=a2df3faea7d5e93b55a10a76e166b8f7

What is the current bug behavior?

(What actually happens)

What is the expected correct behavior?

https://stage.typo3.org/certification/integrator/certified-integrator-listing/B/

Acceptence Criterias

• Navigation thru the alphabetical list, should provide the letter in the URL (f.e. B)

Relevant logs and/or screenshots

(Paste any relevant logs - please use code blocks (```) to format console output, logs, and code as it's very hard to read otherwise.)

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)