Sniffers continue digging after their target block is destroyed

Summary

Sniffers can be continues to dig after their target block is destroyed by player

similar issue to MC-262069

Addon/Resource packs: No

Attachments: Yes

Steps to Reproduce

1. Summon a sniffer and wait for it to begin digging
2. Quickly break the block that the sniffer begins digging
3. Observe the sniffer's behavior for a while

Observed Behavior

Sniffers can continue digging after block is destroyed by player

Expected Behavior

Sniffers would stop digging after their target block is destroyed