TPLink RE450 going out of memory 19.07.3

Having the same problem, I'm on [19.07.5].
I think memory is not initialised properly.

root@OpenWrt:~# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 2.8M      2.8M         0 100% /rom
tmpfs                    29.1M    276.0K     28.9M   1% /tmp
/dev/mtdblock4            1.7M      1.1M    636.0K  63% /overlay
overlayfs:/overlay        1.7M      1.1M    636.0K  63% /
tmpfs                   512.0K         0    512.0K   0% /dev
root@OpenWrt:~# free -h
              total        used        free      shared  buff/cache   available
Mem:          59640       35836       17664         276        6140        9092