Double tapping an OSM mod can cause another OSM mod to get stuck

Setup

I have two OSM modifiers:

#define OSMLSFT OSM(MOD_LSFT)
#define OSMLALT OSM(MOD_LALT)

Actions

I perform the following sequence, quickly:

• Tap OSMLSFT
• Tap OSMLALT
• Tap OSMLALT

Result

OSMLSFT is now stuck, all taps to alphanumeric part of keyboard output capital letters.

To clear I have to hold down OSMLSFT and hit another key.

Cause

Unclear. Double tapping a one shot mod should clear all mods, as this part of the code presumably does: https://github.com/qmk/qmk_firmware/blob/master/tmk_core/common/action.c#L290-L293

Debug

This is debug output of the actions mentioned above:

 > 
    ---- action_exec: start -----
    EVENT: 0301d(6277)
    Tapping: Start(Press tap key).
    TAPPING_KEY=0301d(6277):0 
    processed: 0301d(6277):0 
    
  > 
    ---- action_exec: start -----
    EVENT: 0301u(6373)
    Tapping: First tap(0->1).
    TAPPING_KEY=0301d(6277):1 
    ACTION: ACT_LMODS_TAP[2:00] layer_state: 00000000(0) default_layer_state: 00000001(0)
    MODS_TAP: Oneshot: start
    waiting_buffer_enq: { [0]=0301u(6373):1  }
    ---- action_exec: process waiting_buffer -----
    Tapping: Tap release(1)
    ACTION: ACT_LMODS_TAP[2:00] layer_state: 00000000(0) default_layer_state: 00000001(0)
    TAPPING_KEY=0301u(6373):1 
    processed: waiting_buffer[0] = 0301u(6373):1 
    
    
  > 
    ---- action_exec: start -----
    EVENT: 0302d(6453)
    Tapping: Start with interfering other tap.
    TAPPING_KEY=0302d(6453):0 
    processed: 0302d(6453):0 
    
  > 
    ---- action_exec: start -----
    EVENT: 0302u(6529)
    Tapping: First tap(0->1).
    TAPPING_KEY=0302d(6453):1 
    ACTION: ACT_LMODS_TAP[4:00] layer_state: 00000000(0) default_layer_state: 00000001(0)
    MODS_TAP: Oneshot: start
    waiting_buffer_enq: { [1]=0302u(6529):1  }
    ---- action_exec: process waiting_buffer -----
    Tapping: Tap release(1)
    ACTION: ACT_LMODS_TAP[4:00] layer_state: 00000000(0) default_layer_state: 00000001(0)
    TAPPING_KEY=0302u(6529):1 
    processed: waiting_buffer[1] = 0302u(6529):1 
    
    
  > 
    ---- action_exec: start -----
    EVENT: 0302d(6605)
    Tapping: Tap press(2)
    ACTION: ACT_LMODS_TAP[4:00] layer_state: 00000000(0) default_layer_state: 00000001(0)
  > TAPPING_KEY=0302d(6605):2 
    processed: 0302d(6605):2 
    
  > 
    ---- action_exec: start -----
    EVENT: 0302u(6699)
    Tapping: Tap release(2)
    ACTION: ACT_LMODS_TAP[4:00] layer_state: 00000000(0) default_layer_state: 00000001(0)
    TAPPING_KEY=0302u(6699):2 
    processed: 0302u(6699):2 
    
  > Tapping: End(Timeout after releasing last tap): FFFFu(6899)
    TAPPING_KEY=0000u(0):0