Hi Ryedaman
welcome to this Apple (user-to-user) Community :-)
Re: "iPhone Classic Invert and Zoom not working"
Am no expert in this area, yet your post to the community deserves some reply. The experts with the accessibility software are often those, like yourself, who make use of the featurss often.
Keeping the iPhone's iOS version up-to-date often helps in avoiding issues.
Eg: The latest version: iOS 26.4,2, contained bug-fixes and security updates.
You can look in Settings > General > Software Updates, to see if an update is available.
Reminder: It is always wise to back-up iPhone first, if you choose to update the iOS version,
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Else: If you already have iOS 26.4,2 installed:
You may want to try restarting your iPhone
ie: deletes temporary files, re-establishes connections, may update any recent setting changes, and more. A restart will often restore order if something is not working as expected.
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If updating or restarting hasn't helped:
You may want to reach out to the experts on Apple's Accessibility Support Team. They can often assist with the accessibility features.
See: How to contact Apple for help with accessibility features - Apple Support
All the best :-)