https://www.bbc.com/future/article/20200622-the-long-term-effects-of-covid-19-infection
Now, more than 300 studies from around the world have found a prevalence of neurological abnormalities in Covid-19 patients, including mild symptoms like headaches, loss of smell (anosmia) and tingling sensations (arcoparasthesia), up to more severe outcomes such as aphasia (inability to speak), strokes and seizures.

No word on how temporary/permanent some of these are but a stroke has to leave a mark...