This may be a regression introduced by this commit:
commit 20bd1d026aacc5399464f8328f305985c493cde3
Author: Jeremy Cline <jer...@jcline.org>
Date:   Tue Mar 6 21:47:32 2018 +0000

    scsi: sd: Keep disk read-only when re-reading partition
    
    If the read-only flag is true on a SCSI disk, re-reading the partition
    table sets the flag back to false.
    
    To observe this bug, you can run:
    
    1. blockdev --setro /dev/sda
    2. blockdev --rereadpt /dev/sda
    3. blockdev --getro /dev/sda
    
    This commit reads the disk's old state and combines it with the device
    disk-reported state rather than unconditionally marking it as RW.
    
    Reported-by: Li Ning <lining916740...@icloud.com>
    Signed-off-by: Jeremy Cline <jer...@jcline.org>
    Signed-off-by: Martin K. Petersen <martin.peter...@oracle.com>

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https://bugs.launchpad.net/bugs/1823346

Title:
  SD card stays locked even when unlocked

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