I usually Shift+space click whilst flying to put a block on the bottom of a furnace in the water.
But before i can place the block, i suddenly float slowly! That never happened before in 1.10 and other prvious version (This will only work in creative mode whilst flying)
Linked issues
Comments 4

hey, its creative mode not spectator man

I know, but at least one report only about Creative mode was already marked as duplicate of that report. Therefore I changed it to include Creative mode as well now.
k howzey
Related to or maybe even a duplicate of MC-64163