I have this old world i created back in Pocket Edition Alpha 0.10.5 i think and i hadn't loaded it since April 1th 2018. When i tried to open it in 1.16.0 it crashed the game while loading, both on iOS and on Windows 10. Then i tried deleting the world_resource_packs.json file attached below and when i tried loading it, it suddenly worked. However there are still issues with this world, but i will report them in a seperate ticket.
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Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response
To make your bug report as effective as possible, please try and include the following steps to reproduce the problem:
Steps to Reproduce:
1.
2.
3.Observed Results:
(Briefly describe what happens)Expected Results:
(Briefly describe what should happen)
If your ticket does not look like the example given here, then it's likely to be closed as incomplete.
This ticket will automatically reopen when you reply.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki

To exactly reproduce this you would have to use an extremely old version and then open the world in a new version. But I don't have access to old versions so I can't reproduce this in any way.

Is this still an issue in the latest version? If so, can you add it to the affected versions?

Is this still an issue in the latest version? If so, can you add it to the affected versions?
Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
For any account or purchasing related issues, please contact Minecraft Customer Support directly, as we cannot assist with those here at the bug tracker.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki
Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
For any account or purchasing related issues, please contact Minecraft Customer Support directly, as we cannot assist with those here at the bug tracker.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki