Where is nvme0n1p3... an 'extended' partition holding p4?
It appears to be swap.
Disk /dev/nvme0n1: 1.86 TiB, 2048408248320 bytes, 4000797360 sectors
Disk model: INTEL SSDPEKNW020T8
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: FEA3CC89-4737-418E-BC3E-DB60195A22D4
Device Start End Sectors Size Type
/dev/nvme0n1p1 2048 391167 389120 190M EFI System
/dev/nvme0n1p2 391168 5634047 5242880 2.5G Linux filesystem
/dev/nvme0n1p3 5634048 30799871 25165824 12G Linux swap
/dev/nvme0n1p4 30799872 3981834239 3951034368 1.8T Linux filesystem