sort.core error doing installworld on Current.

I have a machine running FreeBSD head.
rev 13.0-CURRENT #11 r360008

This is a quite powerful machine, so i thought it was a good idea to let 
that server do the build and for my virtualbox machine i can use the 
powerful machine to do a installword over NFS.

But when i did the make installworld step the client so to say gives an 
error.

install   -o root -g wheel -m 444 
/usr/obj/usr/src/amd64.amd64/share/zoneinfo/builddir/Zulu 
/usr/share/zoneinfo/Zulu
install   -o root -g wheel -m 444 
/usr/obj/usr/src/amd64.amd64/share/zoneinfo/builddir/posixrules 
/usr/share/zoneinfo/posixrules
install   -o root -g wheel -m 444 
/usr/obj/usr/src/amd64.amd64/share/zoneinfo/builddir/sort.core 
/usr/share/zoneinfo/sort.core
install: /usr/obj/usr/src/amd64.amd64/share/zoneinfo/builddir/sort.core: 
Permission denied
*** Error code 71

Stop.
bmake[5]: stopped in /usr/src/share/zoneinfo
*** Error code 1

Stop.
bmake[4]: stopped in /usr/src/share
*** Error code 1

Stop.
bmake[3]: stopped in /usr/src
*** Error code 1

Stop.
bmake[2]: stopped in /usr/src
*** Error code 1

Stop.
bmake[1]: stopped in /usr/src
*** Error code 1

Stop.
make: stopped in /usr/src
.ERROR_TARGET='installworld'
.ERROR_META_FILE=''
.MAKE.LEVEL='0'
MAKEFILE=''
.MAKE.MODE='normal'
_ERROR_CMD='.PHONY'
.CURDIR='/usr/src'
.MAKE='make'
.OBJDIR='/usr/obj/usr/src/amd64.amd64'
.TARGETS='installworld'
DESTDIR=''
LD_LIBRARY_PATH=''
MACHINE='amd64'
MACHINE_ARCH='amd64'
MAKEOBJDIRPREFIX='/usr/obj'
MAKESYSPATH='/usr/src/share/mk'
MAKE_VERSION='20181221'
PATH='/sbin:/bin:/usr/sbin:/usr/bin'
SRCTOP='/usr/src'
OBJTOP='/usr/obj/usr/src/amd64.amd64'

It looks likes sort coredumps in the usr/share/zoneinfo part of the base.
As it has no permission on the NFS share it errors out.
On the server itself, the installworld goes well, but it leaves a 
sort.core file behind in /usr/share/zoneinfo

cd /usr/share/zoneinfo
ls -al
-r--r--r--   1 root  wheel          118 Apr 16 20:25 Zulu
-r--r--r--   1 root  wheel        3519 Apr 16 20:25 posixrules
-r--r--r--   1 root  wheel  8982528 Apr 16 20:25 sort.core
-r--r--r--   1 root  wheel      19424 Apr 16 20:25 zone.tab
-r--r--r--   1 root  wheel      17955 Apr 16 20:25 zone1970.tab

my src.conf file looks like this
WITHOUT_BLUETOOTH=yes
WITHOUT_CALENDAR=yes
WITHOUT_DICT=yes
WITHOUT_GAMES=yes
WITHOUT_I4B=yes
WITHOUT_IPFILTER=yes
WITHOUT_IPX=yes
WITHOUT_LPR=yes
WITHOUT_PROFILE=yes
WITHOUT_SENDMAIL=yes
WITHOUT_SHAREDOCS=yes
WITHOUT_WIRELESS=yes
WITHOUT_HAST=yes
WITHOUT_LLVM_TARGET_{MIPS,POWERPC,SPARC,RISCV}= YES
WITHOUT_LIB32=yes

in /etc/make.conf i have the following
MALLOC_PRODUCTION=yes
BATCH_DELETE_OLD_FILES= yes
CUPS_OVERWRITE_BASE=yes


What can i do about this?

Thank you for your time.