In new words created since the update, exiting a boat can result in the boat disappearing. When Sam’s/gravel is falling, it falls halfway, stops, and then falls and can be collected.
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Ah, yeah, that happened to my librarians around a month ago, but the boat issue has only affected worlds created since the update; previous worlds seem unaffected. Do you have the lag for falling blocks such as sand/ gravel?

These issues are being tracked at MCPE-142010 and MCPE-108568, so I will resolve and link this ticket as a duplicate. In the future, please put only one bug in each ticket.
the boats disappearing is happening to my world as well, and i play on pocket edition. another thing that has been happening is villagers disappearing in villages.