Hex Grid - need help with destroying 3 or more tiles

I am trying to make a game like this -

So far I have my grid, I have a way to find out which neighbors each node has. I am able to swap tiles with clicking.

My goal is to trigger combos like in the video when I move a tile around and have it next to other tiles of the same type.

I have it half working, if I move a jalepeno tile next to a group of other jalepeno tiles it will destroy all of the ones that are touching except the swapped tile. It just doesn't work in certain situations ><
Hoping someone who has made a game like this before can point me in the right direction for figuring out how to handle combos correctly! Thank you.

my bad code...
https://gist.github.com/burglekutt/db9ad9db2258548594dedb12bb3ff159