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runpath with $ORIGIN ignored when program is set user id root

I am trying to run an application that is set user id root on Raspbian :

-rwsr-xr-x 1 root user 508K May 11 13:55 my_app

This application is shipped with a shared library installed in a non standard location (within the deployment directory /opt/my_project/) :

├── my_app
├── libs
│  └── libMyLib.so

The binary has a correct runpath set when i check it with chrpath -l my_app :

my_app: RUNPATH=/usr/local/qt6/lib/:$ORIGIN/libs

However, libMyLib.so is not found when i try to run the application :

./my_app: error while loading shared libraries: libMyLib.so: cannot open shared object file: No such file or directory

For testing purposes, i have removed the set user id bit and the library is found (but of course the application won't run correctly).

Also when i check what ld has found using ldd my_app :

libMyLib.so => /opt/my_project/./libs/libMyLib.so (0x76e84000)

But then i have the previous error at run-time.

Another point is that when i replace $ORIGIN with the absolute path to the library using chrpath, it's also fine. It seems the issue is with $ORIGIN, as if the additional path containing the dynamic string $ORIGIN was removed from the search path when the program is set user id root.

From https://www.man7.org/linux/man-pages/man8/ld.so.8.html, i read that LD_LIBRARY_PATH is ignored in secure-execution mode which is the case here but i don't see any secure warning related to $ORIGIN.

What is the correct way to fix this ? (A part from using chrpath -r during installation if possible).

Thanks.

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runpath with $ORIGIN ignored when program is set user id root

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