Minecraft Beta for Bedrock on XBOX One update for me today. When I loaded up a game I went to place a boat in the water and it placed but was not removed from my inventory like I was in creative, but the game was running survivor. Have not tested to see if it would do the same for minecarts yet.
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We're tracking this issue in MCPE-136445, so this ticket is being resolved and linked as a duplicate.
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