I have purchased winter dragon by cyclone designs from the minecraft marketplace.

When trying to create a new world based on the winter dragon template, minecraft crashes. After minecraft is restarted, a new world based on the template is present in the list of worlds, but minecraft crashes again if one tries to load it, or if one tries to create another new world based on the same template. I have also tried to reboot the IOS, but have observed same behaviour.  Tried on 1.14.1 first, then tried after update to 1.14.20, but same result. Note that when supposedly loading, the progress bar is always at zero.

Also there are no problems when loading other worlds, or creating from other templates.