he arrow flies, stops, and flies again

Duplicate of Projectiles (including arrows) sometimes pass through entities without hitting them - Minecraft: Java Edition - Jira Service Management

Could you please clarify if the arrow goes through the entity or if it just bounces off of it?

• If the arrow goes directly through the entity without hitting it, this would be, as Victor said, a duplicate of MC-214546.

• If it bounces off the entity, as if it had a shield, the issue is already being tracked at MC-102732.