All IMIX NAT44DET 4m 16m scale tests fail due to not creating required session count

error: Not all DET44 sessions have been established

test: IMIX NAT44DET 1m 4m 16m

frequency: all

testbeds: 2n-zn2

examples:

https://s3-logs.fd.io/vex-yul-rot-jenkins-1/csit-vpp-perf-report-coverage-2202-2n-zn2/22/log.html.gz#s1-s1-s1-s1-s3-t7

https://s3-logs.fd.io/vex-yul-rot-jenkins-1/csit-vpp-perf-report-coverage-2206-2n-zn2/7/log.html.gz#s1-s1-s1-s1-s6-t7

notes: Number of sessions created is always the same.

4m:   2747500 != 4128768
16m: 9747501 != 16515072

NOTES: in 22.06 the problem occured in 1m too