I have several macros that do not show the correct icon. Seems like it might be all the same problem.
This is a BM hunter macro.

#showtooltip
/use [mod:ctrl,@cursor]Tar Trap
/stopmacro [mod:ctrl]
/petattack
/use [mod:shift]Bestial Wrath;Kill Command
/use Claw
/use Bite
/use Smack

Outside of mega macro it works like this;

• without any buttons pressed the Kill command icon is displayed
• when pressing shift the Bestial Wrath icon is displayed
  -when the control key is pressed the Tar Trap icon is displayed

In Mega Macro:

• without any buttons pressed an icon with 3 claws is displayed (some sort of default im guessing since all my macros have it)
• when pressing shift no change the same 3 claw/default icon
  -when the control key is pressed the Tar Trap icon is displayed (this works as expected)

More examples of failing macros:
#showtooltip
/petattack
/cast Counter Shot
/use Claw(Basic Attack)
/use Bite(Basic Attack)
/use Smack(Basic Attack)

#showtooltip Barbed Shot
/petattack
/cast [mod:shift] Multi-Shot; Barbed Shot
/use Claw
/use Bite
/use Smack

#showtooltip
/petattack
/use 13
/cast Multi-Shot
/use Claw(Basic Attack)
/use Bite(Basic Attack)
/use Smack(Basic Attack)

Thank you for the addon!

This is intended functionality. The /petattack command has an icon in Mega Macro. If you move it to be the last command (or just later) then that will resolve your issue.

That was it, tyvm