Can't use industry marker 2

[brettspieltreff]

i've got a rule question. have a look at this game:
https://boardgamearena.com/3/ultimatera ... =274162555

current situation:


my plan:
* moving forward on track dresden, getting this one:

* with step 7 i can move forward with industry marker 1
* then i'm getting this one:

* i then use this one:

* then i use the wooden track on dresden moving forward to step 8, wanna get the second industry marker
* the panel tells me that another industry maker is unlocked, but i can't see him


is this a bug or am i not allowed to use the industry marker at this point?

thanks for response.