I have a realm and I've built a SLIME FARM but my slimes could careless about the Iron Golem's. I tried a glass cages and fence cages but the slimes don't go towards the Iron Golems.

Excel Doc contains rough Blueprints of the Farm 

This is on my REALM, so effects XBOX, Mobile and PC (Bedrock).

Reproduced on LOCAL worlds on creative and survival on XBOX and PC (Bedrock).

Can produce a video if necessary.