ORD Error in top mesh

Hi,

We're having problem with top mesh going across the corridor in some areas where End Condition Exception (I've got number of ECE but the issue is only in few locations) is applied. Does anyone come across this? Any idea what may causing it? Is it a bug? I'm running 2020R2. Thanks.

Top mesh with ECE enabled:

Top mesh when ECE is disabled:

Regards,
Krzysztof