You created a custom application rule and sandbox (cust_appX_ps) and observed that the child process is routed to the Default Windows Programs and Services (def_winsvc_ps) sandbox rather than cust_appX_ps.
DCS 6.9.x
DCS 6.10.x
This is a known issue that was fixed in SDCSSPreventionPolicyPack-v6.10.2-m6.0.0-2026030603 policy pack.
1. Import policy pack SDCSSPreventionPolicyPack-v6.10.2-m6.0.0-2026030603.zip or higher
2. Backup existing policy
3. Update the policy where inheritance problem occurred to the version defined in #1