The ship's hitbox sometimes lags.

First, I don't know if it's my computer's problem or something else. I admit my computer is slow. But I tried it on a third-party Java Edition launcher on my phone, and the same problem occurred. My phone has better specs than my computer, and no other lagging issues happen on the phone.

I was just messing around and placed a raft. When I stood on it, I started lagging and couldn't move. Switching to Creative mode and flying fixed it. At first, I thought it might be my computer, so I tried the mobile version, but the same problem occurred.

I then tried a superflat world with a water preset. After placing the boat and standing on it, there was no issue. I found it really strange. But when I returned to the main world, the problem was gone at first, though the lag eventually came back later.

Then, I placed the boat on land and stood on it—the lag was completely gone. I tested this multiple times with no problems. I'm wondering if it's an issue on my end. If not, I'll report it directly.

The problematic boats include all types:
It started with rafts, and all transport boats and transport rafts eventually had the issue.

Reproduction Steps:
In the Overworld (must be the Overworld, survival or creative mode doesn't matter),
Craft a boat and place it directly on the water surface. Have the player stand on it and move around (forward, backward, left, right). After a while, the stuttering issue will occur.