Many people were delighted when Apple returned the SD card reader to its latest MacBook Pro models. Unfortunately, there have been a number of complaints about the reader slot on the new 14- and 16-inch MacBook Pro models not working as expected. In some cases, the SD cards crash and can’t be accessed, while others are noticing unusually slow

Source: Hot Hardware – Apple M1-Powered MacBook Pro Owners Report Frustrating SD Card Reader Issues