What is a proper way to serve a Drive-Through in this game???

Alright I don't know if this is a bug or not, but, title. And hopefully if this is a bug, someone from EA can pass this on to the devs.

I did a league race at Suzuka, and got a DT for speeding under SC on lap 14. Fair enough, I totally zoned out and was only focused on the catch up message. So I thought, "Okay maybe I can serve it under SC?" Nope! Alright, that's understandable, I'm used to that rule from experiencing it in NR2003, can't clear a penalty under yellow. Fast forward to lap 16, a SC restart, go into pit road, it drives through with no prompt to go into the pit box (lap 17 now), but the penalty stays. Okay, annoyed, but I have three laps to- oh hey a SC, can't serve it now. Fast-forward another two laps (lap 19) to the SC restart, go past pit road, and only in sector 3 on lap 20 am I told it's my last lap to serve the drive-through, which I do.

What do you mean it's my LAST LAP? Why didn't my DT serve on a restart when it didn't prompt me to box?? Unless I'm totally blind, there's nothing in the F1 regulations, nor was there an in-game message that stated "Hey, you can't serve this on a restart, you have to go past the timing line and then come in." Which is pretty ridiculous in its own right. If a 3rd SC came out in that period, I probably would've been disqualified.

Of course I understand the whole, "Well don't speed under SC then," but the process to serve it is just so confusing when I get prompted with pit-entry lines and there's no prompt to box. So like, I served it the first time, it just never registered.