That's the kind of internal information that is seldom disclosed by SSD manufacturers. Toward the end of the planar NAND era there were several notable cases of vendors having to add background reads/scrubbing because data retention was quite poor with tiny planar TLC cells, and there were measurable performance losses when reading stale data due to the extra ECC required to recover the original data. There are also some enterprise drives or array appliances that have documented behavior where after a long period of being unpowered, they'll operate with reduced performance for a while while a scrub is done.
But for normal use cases, you're either writing enough data that everything on the drive ends up refreshed at least once or twice per year, or you're writing so little data that your flash is basically not getting worn out at all and the retention times will be extremely long, so you're left worrying about read disturb errors which are pretty unlikely to grow into uncorrectable errors without a rowhammer-like workload.
I'm pretty sure most consumer SSDs are not doing full-drive scrubs after every power loss, both because I've never seen evidence of that while measuring SSD power consumption and because it would be insane to do given that it is common for the SSD to be completely powered off every time you close the lid of your laptop.