Don't know if this is an issue known from the stack-based triggers feature or from the individual cards themselves Durable Handicraft and Era of Innovation so here is the situation :

- Durable Handicraft and Era of Innovation are in the bf with 2 City of Brass and 1 Ornithopter in hand with 6 Energy Counters



- Ornithopter is cast from hand, both enchantments trigger



- Caster want to activate Durable Handicraft 1st but not Era of Innovation so Durable Handicraft purple trigger is selected



Durable Handicraft effect is put on the stack but Era of Innovation effect resolve 1st and game ask for it before Durable Handicraft one