Nokia 7.1 files encrypting, but not decrypting after adding microSDXC

I have a Nokia 7.1 that had some existing photos, videos and other misc files. I added a micro SDXC card and accepted the option to use it as internal storage, with the option of migrating the existing data. The phone completed the process and still works, however the photos and videos etc. are unable to be opened. Interestingly, new photos can be accessed for a brief period of time before becoming inaccessible. The files show a high entropy when anaylsing them with jpeg recovery tools. This leads me to believe that the files are being encrypted, however they are not being decrypted. The device has not been reset, this happened without taking the SD card out of the phone. The fact that files are being encrypted makes me think the device could still have the keys required to decrypt the data. Is there anything I could try to decrypt the files based on this scenario? **EDIT:** Just to add some clarifications based on comments: - The phone still works which makes it unlikely to be a bad card - There's no custom encryption software installed - Malware is unlikely, the process of using the card as internal storage led to the issue **EDIT 2** Any possible solutions for me to try would be most welcome