Iron Golems Stop Spawning on Iron Farm

Hey!

i just spent 2 hours making a iron farm in minecraft, to my relief it worked! I made like 40 iron (on spawn chunk btw) and then I walked to my home assuming since on spawn chunk it would continue to work, after about 2 hours I come back and it is stalled at 52 iron. Iron golems stopped spawning so I then did the following to try to solve it:

-Checked area using commands to make sure no iron golems are living near by

-Killed villagers and replaced (took forever)

-Killed Zombie and replaced (took forever)

-Restarted Server (This is running on Aternos server but only me uses it atm because friend who is going to play hasn't had time to join yet)

-This one is interesting: I tried making a iron golem above where they are supposed to spawn but when I finished nothing happend! I then tore it down and re did it on ground level and it worked. I then went back up and did it and it worked, very weird. but no iron golems spawning yet...

 

I really need help fast! I also didnt change versions or do any mods or anything, just vanilla minecraft.

 

VIDEO TO SEE IRON FARM SETUP AND GOLEMS NOT SPAWNING - https://streamable.com/4kphe

 

EDIT/UPDATE TO PROBLEM:

I just tried replacing all the beds and then closing off the zombie from villagers so they would sleep in beds and then opening it and it worked! I then left to head back home to test if it would continue come back in 30 minutes to see two stacks of iron and hear a iron golem dieing which meant it is still working... but then... everything stopped. I tried repeating bed trick/block off zombie trick again during day and night with no results so it is now broken again.

It seems as if this may be that when I reload these chunks the beds reassign but since I can't "refix" it makes this really weird, keep in mind these are spawn chunks.

I will continue to update this as I find stuff hopefully I get mod/admin/dev to respond soon!