When you deploy a tripwire it doesn't show the normal imagine in the vicinity screen and does not give you an option to attach anything. You dont get the option to attach a grenade when you are holding one in your hand. the only interaction option you have is with empty hands. "f" to pick up or hold f to pick up to your hands.
Relogging fixes and you can attach a grenade, but if you pick up the tripwire and deploy it again you face the same issue.
Thanks for your hard work.