Is it possible for a filesystem type to be recognized differently or changed without reformatting a drive?

When running sudo fdisk -l my EXT4 formatted SamsungQVO USB SSD now identifies as APFS.

Device      Start        End    Sectors  Size Type
/dev/sda2  409640 3907029127 3906619488  1.8T Apple APFS

The disk was previously formatted APFS on macOS before formatting on a Linux computer as EXT4, to copy data from another EXT4 drive and use on a Raspi5 OS.

Debian GNU/Linux 12 (bookworm) aarch64
Host: Raspberry Pi 5 Model B Rev 1.0 
Kernel: 6.1.0-rpi6-rpi-2712

Not expecting the drive to be unrecognized, I created an entry in fstab and expected an error when running mount -a however it did not and after rebooting, is still mounted but recognized as APFS. The only thing which I changed in between was to move data on the disk. Is there any possible explanation for this behavior or is it likely that I have inexplicably done something I'm not aware of?