While holding down crouch, you're sometimes unable to jump again until you fully uncrouch

[kassibuss]

Build Info

20260201_bc59026

Description

You cannot jump right after you have let gone of crouch, you have to wait for your character to fully stand up before you can properly jump

To Reproduce

1. Hold down crouch
2. Let down of crouch
3. Try to jump after you have let gone of crouch

Expected behavior

You should be able to jump right after you have let gone of your crouch key

Actual behavior

You have to wait until your character has fully stood up to be able to jump

Operating System

• Windows
• Linux

Version/Distro

10

Machine's CPU

No response

Machine's GPU

No response

GPU's driver

No response

Build's compiler

No response

Additional context and Screenshots

https://github.com/user-attachments/assets/102eba47-343c-43e5-b93e-50da8ac4bdce
https://github.com/user-attachments/assets/fac003ff-77f4-4e38-ab10-a4049c3db44a

[Rainyan]

The issue described seems to be parity for OG NT movement I think(?)

[Agiel]

Can confirm that this is parity. Might still be something we'll want to fix in the future though.

[Agiel]

For the record this is the offending code in CGameMovement::CheckJumpButton:

// Cannot jump will in the unduck transition.
if ( player->m_Local.m_bDucking && (  player->GetFlags() & FL_DUCKING ) )
	return false;

// Still updating the eye position.
if ( player->m_Local.m_flDuckJumpTime > 0.0f )
	return false;

which is identical in 2013 and 2006, so we're going to need more details from the players reporting this issue.

[Agiel]

Found really simple reproduction steps:

1. Hold crouch.
2. Release crouch.
3. Before fully uncrouched press and hold crouch again.
4. Congrats you're now unable to jump.

[Agiel]

Fun fact, I verified that this bug exists in HL2DM but it's most likely in all other Source 2013 games as well.