There is no diffrence between blocks. Black and pink are for every block exept for animals and water, the only difference is by name. Water is black and blue. I do use experimental gameplay, and downloaded everything free in the Marketplace.
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Thank you for your report!
We're actually already tracking this issue at MCPE-41495, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
[Mojang] Mega_Spud (Jay)
(This issue usually occurs when the textures haven't been downloaded correctly when updating the game - reinstalling the game usually resolves the issue. Please ensure your worlds are synced fully / backed up beforehand.)