Random Respawn vs. Bag/Bed Respawn

I don't think there is a way to differentiate them using the oxide hook alone.

What you could do is a Vis check for a sleeping bag or bed within ~2 meter of the newly spawned player. Then check the ownership of said sleeping bag to confirm it is actually a bag they own. Given the (relatively) new cooldown on nearby bags there isn't much incentive to place a ton of bags right next to eachother, therein making this method more reliable.

Below is some untested psuedo-code but should put you on that track.. The code below assumes that the player position has already updated to the spawn position by the time this hook is called. I cannot confirm that is the case right now but I think it is reasonable to assume it is.

Code:

void OnPlayerRespawned(BasePlayer player)
{
    List<SleepingBag> bags = new List<SleepingBag>();
    Vis.Entities<SleepingBag>(player.transform.position, 2f, bags);    if(bags.Count > 0) {
        foreach(SleepingBag bag in bags) {
            if(bag.deployerUserID == player.userID) {
                // RESPAWNED AT SLEEPING BAG
                return;
            }
        }
    }
}