Child process lose the suid authority in the Red Hat Enterprise Linux release 8.4.

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Hi,
Our production met a problem in the customer environment which is the Red Hat Enterprise Linux release 8.4 host.
The child processes which was created from the main program of our production lost the suid authority.
The programs of our production had been set the suid authority with the "chmod u+s" command.
The child processes needs the suid authority to do some operations.
This feature which the child processes can use the suid authority is all right in our local Red Hat Enterprise Linux release 8.4 hosts.
But the feature can not run exactly in our customer environment.
I did not know what can affect that the child process lost the suid authority.
Does anyone know what is wrong?

LL

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