The bug
Aiming with the bow while sneaking with the shield in offhand slot makes the hand appear to be below the shield's handle. This applies to more items other than shields as well.
Related issues
is duplicated by
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Confirmed.
Confirmed for 15w43a
Confirmed for 15w44a
Confirmed for 15w46a

Confirmed for 16w06a

Is this still an issue in the latest snapshot 16w44a? If so please update the affected versions.
This is an automated comment on any open or reopened issue with out-of-date affected versions.
Can confirm for MC 1.12.1.

Confirmed for 18w21a, related to MC-125204

Affects 1.13-pre1

@unknown, ticket is yours now.

Please do not mark unreleased versions as affected.
You don't have access to them yet.

Cannot reproduce in 1.15 pre-release 3.

Fixed in 1.15