Sniffer doesn't dig for seeds on a realm

Sniffers do not dig on a realm. I have waited for hours watching my 4 sniffers and they have dug for seeds.

They are in a 30 by 30 pen with grass as the floor. They walk around and sniff the air but do not sniff the ground or do the dig animation.

To test that it was limited to a realm, I downloaded a backup of the realm and loaded it up on a single player world. After 5 minutes all 4 sniffers started the digging for seeds and produced seeds.

TLDR;

• issue- sniffers do not dig on realms

• test- make copy on single player and observe correct sniffer behavior