You can place boats into blocks by looking close to the upper edge of a block without anything above (see video).
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We're tracking this issue in MC-208823, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Boats placed on the side of blocks will fall through them and this is intentional as stated in MC-208823. As for the issue with boats being able to pass through walls, that's MC-101334. 😃