After activating any texture pack in Global Resources, and then properly quitting the game, the next time Minecraft is opened the texture pack is no longer active and needs to be activated again.
I have deleted and re-downloaded the texture packs and the issue still occurs.
This issue applies to any texture pack purchased from the Marketplace.
Thank you for your report!
We're tracking this issue in MCPE-33009, so this ticket is being 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.
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