Since gerrit 66366 the block reason of a existing autoblock is adjust to the reason of the normal block, when that block was changed.
In my opinion the reason should still be wrapped in the message 'autoblocker' to have the known text there.

Steps to reproduce:

• Block a user with autoblock
• Log in with that blocked user and trigger the autoblock
• have a look at Special:BlockList
• Change the block with your sysop account
• Have a look at Special:BlockList, the autoblock has the same reason as the normal block

Version: 1.23.0
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=62748