In brewing stands, you can stack over 64. To place over 1 glass bottle in a slot, you shift-click them one-by-one into the brewing stand. After you pick up the first stack and pick up the next one, you pick up every bottle except one. The video can probably explain it better than me.
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Thank you for your report!
We're actually already tracking this issue in MC-114462, 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.
This isn't the same issue.
You can hold more than 64 by your cursor, however it splits up when you try to place it in your inventory. If you throw it, a zombie can pick it up and hold a stack with over 64 items. In the video, it shows a 65 stack.
It may relate but is not a duplicate.
Can confirm.