nagios.cmd is been read only when debug != 0

[zeus]

greetings,

I experience a weird behavior of passive checks ... until I set debug to any value except 0, nagios.cmd is not been read and all passive checks scripts are getting stalled and waiting ... but just I do

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cat nagios.cmd 

all of them are getting finished successfully...

the only log entry related to the issue is this:

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Oct  1 17:16:23 noc nagios: job 7812 (pid=37133): read() returned error 35

neither nagios.log nor nagios.debug doesn't contain anything relevant to the problem

OS: FreeBSD 11.4-RELEASE-p3
nagios version: 4.4.6

any idea where to look at?