On bedrock edition maps, slabs such as a quartz slab do not show up as their block colour, they only show up as grey.
in the screenshot below the platform of quartz slabs beside me is indeed registered as grey on the map whereas quartz is white.
MCPE-44426
Maps on bedrock do not show half slabs colour (ie: Quartz slabs shows up as grey)
Resolved
Duplicate
1
Thank you for your report!
We're actually already tracking this issue at MCPE-19228, 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.