from kernel changelog:
pty,tty problem:
-----------
1.
Driver now requests more device nodes than what was found on the
initial bus walk when registered as a tty driver to make room for hotplug
vty adapters.  These secondary vty adapters provide a tty tunnel between
partitions.

2.
export legacy pty info via sysfs
You missed that one last year.
export the legacy pty/tty device nodes via sysfs,
so udev has a chance to create them if /dev is in tmpfs.
 ------
Solution:
i added a new entry in udev.rules file to correct that
these devices are now listed in legacy
add this to udev.rules
# pty legacy devices
KERNEL="pty[a-z][a-z,0-9]*", NAME="legacy/%k"

# tty[a-z][0-9] legacy devices
KERNEL="tty[a-z][a-z,0-9]*", NAME="legacy/%k"