Editable Template policy is not getting updated with mode=merge or mode=update or mode=replace or without any mode
My current version is AEM 6.5.12
I need to delete flex_grid from xxx template policies.

I have tried with all the options in filter.xml but my changes are not reflected in crx/de post deployment.
Note:
1. After I remove flex_grid node from codebase and build the package then flex_grid node is removed in the build package.
2. If I delete section-fw manually and reinstall the package then flex_grid will be removed in crx/de.
Awaiting for your suggestions!! @arunpatidar
Thanks in advance.