Steps to reproduce:
1.Give yourself a fishing rod.
2.Look directly up.
(Optional) 3.Press F5 two times.
4.Cast the fishing rod and see that it casts at the floor.
Related issues
Comments

Thank you for your report!
However, this issue is a Duplicate of MC-1058.
It has been linked to this report. If you have additional information, please add it to that report.
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Cannot reproduce this.