Devel::NYTProf::Apache nytprof files inaccessable even via /proc/<apachepid>/fd/

[imesmits]

Devel::NYTProf::Apache is operational as in /proc/fd// it shows the nytprof output files:

lr-x------ 1 root root 64 Mar 12 11:43 0 -> /dev/null
l-wx------ 1 root root 64 Mar 12 11:43 1 -> /dev/null
l-wx------ 1 root root 64 Mar 12 11:43 10 -> /tmp/nytprof.13142.out.13155
l-wx------ 1 root root 64 Mar 12 11:43 11 -> /var/log/apache2/access.log
l-wx------ 1 root root 64 Mar 12 11:43 2 -> /var/log/apache2/error.log
lrwx------ 1 root root 64 Mar 12 11:43 3 -> 'socket:[133547]'
lrwx------ 1 root root 64 Mar 12 11:43 4 -> 'socket:[133548]'
lrwx------ 1 root root 64 Mar 12 11:43 5 -> 'socket:[133551]'
lrwx------ 1 root root 64 Mar 12 11:43 6 -> 'socket:[133552]'
lr-x------ 1 root root 64 Mar 12 11:43 7 -> 'pipe:[131867]'
l-wx------ 1 root root 64 Mar 12 11:43 8 -> 'pipe:[131867]'

However the file /tmp/nytprof.13142.out.13155 is non-existent. When trying to nytprofhtml /proc/13155/fd/10 tool reports "file truncated":

nytprofhtml -f /proc/13155/fd/10 -o ./wwwroot.d/nytprof/apache2/20200312T114454

Reading /proc/13155/fd/10
Profile data incomplete, inflate error -5 ((null)) at end of input file, perhaps the process didn't exit cleanly or the file has been truncated (refer to TROUBLESHOOTING in the documentation)

Any suggestions?