Empty weapons are able to be picked up when dropped by players. Empty weapons such as rockets or snipers are switched out when ammo is gone. These weapons are able to be picked up by players even though they are empty instead of disappearing.
H1 I believe was always like this.
*Source - Childhood and Weekends of LANs (although I could be coming down with alzheimer’s)
Note: Im ok with this actually, nothing like turning a corner and seeing someone fumbling over picking up an empty rocket launcher.