Similar to MC-667.
In a 1x1 space of water, a player can place a lily pad inside themselves, causing a brief visual jumping glitch.
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Confirmed, attached video:
[media]

Affects 1.2.16
Thank you for your report!
However, this issue has been closed as Working as Intended.
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How can this be a completely intentional feature if the corresponding Java Edition ticket is still agreed to be a bug?

Still awaiting a response - this is clearly inconsistent behaviour (and also somewhat of a parity issue as java fixed this in 1.16).
I created a new ticket for this, since this is now a parity issue, since it was fixed for java. MCPE-112516