How to get ancient debris in Minecraft PE?

I am playing MCPE and I have been looking for ancient debris through blowing up beds in the nether for some time now. I have been mining on y = 13-15 but I have not been able to find any ancient debris. Does ancient debris randomly spawn in worlds even in they were created before the 1.16 update? Am I just getting unlucky or am I doing something wrong?

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