In ibxtoycat's video this fossil stops you beating minecraft a fossil had broken a end portal block. this would make you not able to beat minecraft. I know a simple way to fix it: make strongholds the last thing that generates. so instead of the fossil overwriting the strong hold the strong hold over writes the fossil. Here is a link youtube.com/watch?v=cd4k-ERP1cw&t=0s
Thank you for your report!
We're actually already tracking this issue at MCPE-40017, so I will resolve and link this ticket as a duplicate.
That ticket has already been resolved as Won't Fix, which means this is considered a bug but won't be fixed. The description of that ticket or the comments might explain the rationale. Please do not leave a comment on the linked ticket.
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