SUMMARY
The statement with: interface in <% list("1","2","3") %> fails because the string interface contains the substring in. The resulting error message is
TypeError: The value of "terface in <% list("1","2","3") %>" is not type of list.
I this this happens because it is breaking the regex here
I've created a repro workflow here
ISSUE TYPE
STACKSTORM VERSION
st2 2.10.1, on Python 2.7.6
OS / ENVIRONMENT / INSTALL METHOD
default docker container