I have purchased a resource pack vanillabdcraft and installed but when i try load the game into a world it crashes

I have the same problem.

If I go to global resources and add the texture pack manually, then configure it for 128x, it will load. However if I connect to my realm, where the texture pack is configured, without configuring the TP in global resources, the game crashes (black screen)

It seems the game is not accurately detecting the maximum resolution possible.

Also... Configuring the TP in global resources, does not get saved. I have to set that up every time I start the game up.

thanks for this, but where do i configure it for 128x?

Thank you for your report!
We're actually already tracking this issue under MCPE-40666 so I've requested this report be resolved and linked as a duplicate.

If you would like to add a vote and any extra information to the main ticket it would be appreciated.

Please don't forget to use the search feature before submitting a bug to see if it has already been reported. The less time we spend linking duplicates means more time testing and confirming the bugs.

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