XDF Compatibility: One-way clips
Many Q3DF maps have a one-way wall at the start so that after the player has left the starting area, they cannot re-enter it. This is to prevent preruns. Unfortunately, Xonotic doesn't support one-way clips and as a result, these maps are broken because the one-way clip just becomes an invisible wall. Setting g_playerclips_collision to 0 works around the issue, but can break the map in other ways by disabling all other playerclips.
Example maps: dfwc2012-6 df_nuke zarrastahe