Templatizer - How to render multiple times same template, Polymer 2.x - polymer

Question

In Polymer 1.x I was used to write a templatize code like this:
renderTemplate(query, properties) {
let element = this.shadowRoot.querySelector(query);
this.templatize(element);
var instance = this.stamp(properties);
return instance;
}
which worked well. But in Polymer 2.x there is a new error message A <template> can only be templatized once. Well it doesn't make sense, because I have 1 template which I want to redistribute multiple times with different properties.
I am giving here an example of how is my code
I have #template1 and #template2
I want to render #template1 then #template2 then #template1.
In steps how I render templates:
1) templatize #template1
2) stamp properties
3) templatize #template2
4) stamp properties
5 a) templatize #template1 => ERROR
5 b) skip templatize and stamp properties => #template2 is rendered....
How am i able to make this possible? calling stamp() after rendering #template2 will result in another #template2 render. I want #template1, but I can't templatize #template1 because it has been already templatized. And stamp is always "binded" to last templatized element.
Am I doing something wrong? I do really hate Polymer because of it's bad documentation and hard to google something usefull

Answer 1

I found a workaround which is propably not the best solution but it works. I tried to search in source code for some solutions but there wasn't anything usefull except the one property called __templatizeOwner. This property is set to all templatized elements. Removing this property from an element is the way.
renderTemplate(query, properties) {
let element = this.shadowRoot.querySelector(query);
if(element.__templatizeOwner) {
element.__templatizeOwner = null;
}
this.templatize(element);
var instance = this.stamp(properties);
return instance;
}
I am not sure what side effects this might have (more memory usage or something) but this is the only way I was able to find out.