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Hello,

We have exactly the same issue, we disabled the cache but its not a good solution.

A better solution was to modify the function renderWidget of our module. 

we replaced :

return $this->fetch($this->templateFile, $this->getCacheId('ps_specials'));

by 

return $this->fetch($this->templateFile);

And since  we removed the cahche Id everythings is working fine. 

Hello,

We have exactly the same issue, we disabled the cache but its not a good solution.

If someone find a better solution for it would be nice.