Version

PrusaSlicer
Version: 2.3.3+win64
Build: PrusaSlicer-2.3.3+win64-202107161027

Operating System: Windows
System Architecture: 64 bit
Windows Version: Windows 10 (build 19044), 64-bit edition
Total RAM size [MB]: 68,658MB

3D printer brand / version + firmware version (if known)

Modified project red Railcore

Behavior

When using elephant foot comp and brim, The brim is not attached to the object defeating its use.
ie the elephant foot comp makes gap from the brim making the brim useless.

Printed a tall tower and it failed because the brim was not used.

Workaround turn off elephant foot comp. But this issue is not readily apparent and operates differently on other slicers.

Recommendation
Either adjust elephant foot comp to work with brim. (preferable) Y(es this may seem to defeat elephant foot setting or make it harder to remove the brim, but have had success with using both with other slicers with only minor/no issues so it is possible. )
OR disable \ warn one or the other setting when they are both used so stop any confusion.

brim.zip