A very simple way to replicate this is to place a boat on the ground, or I believe in water (both work) and place a pillar of blocks 2+ tall in front of it. If you try to get in the boat in survival, it will not work. However, if you try once you are in creative, it will work. If this is in fact a feature and not a bug, please correct me.
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Try placing a block two blocks below the player, it will work. Then try placing a boat there and getting in. It will not work in survival (block placing will), but will work in creative.
– Unrelated, but also worth noting that while you can ride a boat that is submerged in one block deep of water, you cannot enter the boat. I'm not sure if this is intended or not, but I thought of it after posting the other bug reports.
while you can ride a boat that is submerged in one block deep of water, you cannot enter the boat
It would make a valid report, but make sure to search whether it's already been reported. Your two other reports have already been closed as duplicates.
Can confirm, but it's likely because a player in creative mode can "reach" farther than they can in survival (and adventure).