Some Ruby ports fails with ccache

Hi,

I am using ccache in my environment to speed up port builds, however, 
some ports fails to pass poudriere builds when using ccache, disabling 
it temporarily fixes the problem.

I am wondering the reason.

Poudriere.conf:

CCACHE_DIR=/var/cache/ccache
CCACHE_DIR_NON_ROOT_SAFE=yes
BUILD_AS_NON_ROOT=yes
PORTBUILD_USER=yusuf
PORTBUILD_GROUP=yusuf
PORTBUILD_UID=2005
PORTBUILD_GID=2005

The user/group numbers same as on my host and ccache directory is owned 
by the same.

# ls -1 
/userdata/usr/local/poudriere/data/logs/bulk/144amd64-main/2026-09-23_15h34m57s/logs/errors/
rubygem-erb-6.0.7.log
rubygem-json-2.21.2.log
rubygem-prism-1.9.0.log
rubygem-racc-1.8.1.log
rubygem-rugged-1.9.6.log

Mostly throwing this error below in all logs.

ccache: error: Failed to create directory /var/cache/ccache/tmp: 
Permission denied

Thanks in advance.