When i load chunk containing some block that doesn't exist in MCPE, MCPE crashes. but it should chnage it into an update block, like in 0.14 and older versions
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What we would need is a map from an old version that had a nether reactor core. As far as I can tell, that block is no longer in 0.15.1.
This issue is Invalid, as it is not possible to obtain those blocks in vanilla MCPE.