Hi sad to hear, you may have lost some data?
The SD card really has to be used as External/Portable, as once formatted as internal all the contents are encrypted, so it’s extremely difficult to read the contents outside of the phone.
So if something goes wrong you will have to reformat the card and tweak (reinstall maybe the whole OS) the phone to get back to using the phone properly.
Out of curiosity why transfer apps etc. to the SD card? The best solution is to have the SD card as Portable, that is unencrypted that you can save all your data to and use in another phone etc.
There is a guide. . .