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Issue description:

On our server running latest version of SpongeForge is bug with destroying some blocks from Mekanism (and Forestry), mined blocks won't fell off.

Steps to reproduce:

1. Place e.g. Induction Casing
2. Mine it with Pickaxe
3. Sometimes, block won't instantly destroy, for few moments it just stays on its place, and then disappear.

Version (make sure you are on the latest version before reporting):

Forge: 12.18.3.2511
Mekanism: 9.2.4
Other relevant version: SpongeForge 2477-5.2.0-BETA-2793

If a (crash)log is relevant for this issue, link it here: (It's almost always relevant)

[gist/pastebin/etc link here]
Just one last thing, server is not always running at 20TPS (as it's a modded server with 20+ players) and I think it causes this issue.

EDIT: Blocks are even disappearing when I want to place a block and there is a server lag.

Just one last thing, server is not always running at 20TPS (as it's a modded server with 20+ players) and I think it causes this issue.

It is.

Wow... So you've basically saying it's our problem? What a support...
Why aren't this machines dropped like other blocks, which dropping is just fine?

You described exactly the desync caused by a server not running at full speed, so yes it is your problem. Plenty of resources just a google search away for diagnosing why the lag exists.

Machine blocks save their data to the item and thus may break only server side.