Because it never seem to load in my system. I think i need to use “>-”, I don’t know? I will look into it tomorrow.
But onto a much more important things! @petro I think you have don’t it (i’ll do a heap of testing tomorrow) but I think I owe you a BEEPING BEEB more 
They load on every system, it’s built into yaml. Your spacing needs to be correct. Notice how my templates are indented based on the field they are in.
field: >
{{...
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The Final solution!
@petro you’re a LEGEND!
blueprint:
name: A Test
description: "A Variable State Test for Target Selector input"
domain: script
input:
lights:
name: Targeted Lights
description: The Lights this Script is Targeted at.
selector:
target:
entity:
domain: light
variables:
lights: !input lights
entities: >
{%- set ns = namespace(ret=[]) %}
{%- for key in ['device_id', 'area_id', 'entity_id'] %}
{%- set items = lights.get(key, []) %}
{%- if items %}
{%- set items = [ items ] if items is string else items %}
{%- set filt = key.split('_') | first %}
{%- set items = items if filt == 'entity' else items | map(filt ~ '_entities') | sum(start=[]) %}
{%- set ns.ret = ns.ret + [ items ] %}
{%- endif %}
{%- endfor %}
{{ ns.ret | sum(start=[]) }}
filtered: "{{ entities | select( 'search' , '^light' ) | select('is_state', 'on') | list }}"
lights_on: "{{ filtered | count > 0 }}"
transition: "{{ iif ( lights_on , 90, 0 ) }}"
sequence:
- service: light.turn_on
data:
transition: "{{ transition }}"
target: !input lights
I think i’m going to cry! 
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