ZDoom

No. The problem is in the bouncing code, it needs that flag or it won't work.

The rest of this problem is the same issue as the other one I closed a few hours ago. This is not something that's easily fixed because the logic is so screwed up.

Scenario 2 and 3 has a bounce type. But, shouldn't Projectile; do that CANPASS business?

This cost me quite a bit of time to figure out:

You forgot to set a bounce type. Bouncing missiles require the CANPASS flag, but nothing in your definition sets it, it either needs to be done explicitly or by specifying a bounce type.

Ugh, damn it all to hell. Welp! Looks like I'm going to be pulling in the bounce states for use after all... This is gonna suck.

Sadly these tests are perfectly useless because I cannot go back far enough in commit history to test them on pre-ZScript versions. All I can see is that they do not work, but it's impossible to find out when this broke.

Ugh. Wish I could find the commit where this changed but I will say it was during one of the refactors. I saw something about the onmobj flag, I think. Still searching for it...

Class D : Actor
{
	Actor rr;
	Default
	{
		Monster;
		-COUNTKILL
		+NODAMAGE
		+NOPAIN
		+DONTTHRUST
		Radius 32;
		Height 56;
	}
	States
	{
	Spawn:
		PLAY A 1 NoDelay
		{
			if (A_CheckFloor("Null"))
			{
				Vector3 rocketpos = Vec3Angle(0, angle, height + 12);
				rr = Spawn("BouncyRocket",rocketpos);
				if (rr)
				{
					let br = BouncyRocket(rr);
					if (br)
					{
						br.angle = angle;
						br.A_ChangeVelocity(1,0,-4,CVF_REPLACE);
						return ResolveState(1);
					}
				}
				Destroy();
			}
			return ResolveState(null);
		}
		Wait;
		PLAY A 1
		{
			if (!rr)	Destroy();
		}
		Wait;
	}
}

[code]Class D : Actor
{
Actor rr;
Default
{
Monster;
-COUNTKILL
+NODAMAGE
+NOPAIN
+DONTTHRUST
Radius 32;
Height 56;
}
States
{
Spawn:
PLAY A 1 NoDelay
{
if (A_CheckFloor("Null"))
{
Vector3 rocketpos = Vec3Angle(0, angle, height + 12);
rr = Spawn("BouncyRocket",rocketpos);
if (rr)
{
let br = BouncyRocket(rr);
if (br)
{
br.angle = angle;
br.A_ChangeVelocity(1,0,-4,CVF_REPLACE);
return ResolveState(1);
}
}
Destroy();
}
return ResolveState(null);
}
Wait;
PLAY A 1
{
if (!rr) Destroy();
}
Wait;
}
}
[/code]

BouncyRocket code is different for each scenario to demonstrate relative bugs. Note, for this experiment, just summon D, not BouncyRocket.
[spoiler=Scenario 1][code]Class BouncyRocket : Actor
{
Default
{
Projectile;
+ALLOWBOUNCEONACTORS
+BOUNCEONACTORS
+BRIGHT
Radius 4;
Height 4;
BounceFactor 1.0;
Speed 4;
}
States
{
Spawn:
MISL A 1;
Loop;
Death:
MISL B 8 A_Stop();
MISL C 6;
MISL D 4;
Stop;
}
}[/code]

[list][*][b]Expected behavior:[/b]
Bounces off the top.

[*][b]Result:[/b]
Goes right through though turns around.[/list][/spoiler]

[spoiler=Scenario 2][code]Class BouncyRocket : Actor
{
Default
{
Projectile;
BounceType "Doom";
+BRIGHT
Radius 4;
Height 4;
BounceFactor 1.0;
Speed 4;
}
States
{
Spawn:
MISL A 1;
Loop;
Death:
MISL B 8 A_Stop();
MISL C 6;
MISL D 4;
Stop;
}
}[/code]

[list][*][b]Expected Behavior:[/b] Explode on top of D.
[*][b]Result:[/b] Lands on top, glides across until no longer on top and then continues going down.[/list][/spoiler]

[spoiler=Scenario 3][code]Class BouncyRocket : Actor
{
Default
{
Projectile;
BounceType "Doom";
-ALLOWBOUNCEONACTORS
-BOUNCEONACTORS
+BRIGHT
Radius 4;
Height 4;
BounceFactor 1.0;
Speed 4;
}
States
{
Spawn:
MISL A 1;
Loop;
Death:
MISL B 8 A_Stop();
MISL C 6;
MISL D 4;
Stop;
}
}[/code]

[list][*][b]Expected Result:[/b] Explode on actor D.
[*][b]Result:[/b] Similar to Scenario 2, except it doesn't resume going down. It just goes straight across with no vertical velocity.[/list][/spoiler]