I recently bought a new 1 TB NVMe SSD (970 Evo Plus) to upgrade from my current 256 GB M.2 SATA SSD. The current disk is LUKS encrypted using the default options were when I originally installed ...

If there are multiple drives installed in the computer, then it can create confusion as to which drive has a Bootloader. This scenario usually happens when Master Boot Record is on the wrong drive.