Bugs with Mask Hero Dian and E-Hero Solid Soldier

Without being given all the details it's difficult to know for sure what's happening. Can't help with possible bugs but here are a couple reasons those cards wouldn't activate that I've encountered before. (I believe Dian can also miss timing and there might be enemy effects in play though none jump out at me.)

- Dian's effect doesn't work off just destroying a monster it also needs to send it to the graveyard and there are some pretty common cards out there that get (conditionally) banished instead.

- There are a couple E-Hero cards that restrict special summons. Neos Fusion is a blanket special summon block and is quite prevalent but Blazeman's second effect is more obscure and it still allows you to summon fusion monsters so its easier to overlook and to use Solid Solider/Dian's effects.