Boats are glitchy in general on 20w17a. One of the "glitchy" parts that I've experienced are:
Occasionally unable to ride boats
Can't always sneak whilst standing on top of a boat
Once you're able to sneak whilst standing on a boat, the player movement bugs out and slows you down with slight stuttering.
Linked issues
duplicates 1
Comments 3
Please always keep it to one issue per report - two of the three things you mentioned are duplicates, the first one is too vague. Please open a new report with exact reproduction steps if you are still experiencing it.
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Thank you for your report!
We're tracking this issue in MC-156980 and MC-158131, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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I have this same issue. I am constantly getting stuck in boats and this used to happen a ton in 1.14 and 1.13