Shipwreck chests are experiencing a bug. Go to any shipwreck that contains two chests. One chest will open fine without delays. The other chest will experience problems. You can click on the chest many times and it won't open. Then, after several to thirty seconds, the chest will suddenly open and display its inventory. This issue has not occurred with any other chests.
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violine1101
Thank you for your report!
We're actually already tracking this issue in MC-126244, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.