Describe the bug

I have made a windmill setup. i was working fine till 1-2 days But after that whenever I relaunch the game, I found 1-2 wooden axles missing from the windmill tower.
First, I thought maybe any mob is breaking it. So, I covered it with dirt blocks but still got missing.

To Reproduce
Make a windmill around 16-17 blocks height and then relaunch game (Not sure)

Expected behavior

It should not be missing from windmill setup on relaunching.

Screenshots

Info (please complete the following information):

• Modpack Version: 2.77.5
• Server or Singleplayer: Singleplayer
• Version the world was created on: 2.77.5

Additional context

My PC RAM is 4GB. So, maybe is it due to the low memory of my PC?

It's a bug with BWM. No fix other than to try to have 1-block long axles by putting more gearboxes down.

Fixed in beta 6

Thanks for update

Confirmed.

Given a windmill
And axles at 1 block in length
And axles at 2 blocks in length
And axles at 3 blocks in length
When the world is reloaded
Then the axles are "not broken"