[Bug] `RETRO_TAPPING` does not work with `ALT_T(*)`

Describe the Bug

Even when RETRO_TAPPING is defined, ALT_T(*) works as same as without RETRO_TAPPING.

I reproduced this issue as follows:

• Add the following to crkbd/keymaps/default/config.h:

  #define RETRO_TAPPING
  

• Add the following to crkbd/keymaps/default/keymap.c:

  #define KC_SandA ALT_T(KC_SPC)
  

• Replace KC_RALT with KC_SandA to _QWERTY layer in crkbd/keymaps/default/keymap.c.
• Compile and write the firmware to crkbd
• Press the KC_SandA key over TAPPING_TERM and release it.
  • Expected behavior: A space is sent (we will see a space).
  • Actual behavior: Alt is sent (I saw that a window menu is focused on) rather than a space is sent.

System Information

• Keyboard: crkbd
  • Revision (if applicable): default
• Operating system: Windows 10
• AVR GCC version: avr-gcc (GCC) 5.4.0

• ARM GCC version: arm-none-eabi-gcc (15:6.3.1+svn253039-1build1) 6.3.1 20170620

• QMK Firmware version: 0.8.192

• Any keyboard related software installed?
  • AutoHotKey
  • Karabiner
  • Other: Nothing

Additional Context

I confirmed that SFT_T and CTL_T work as intended.