• Mod version, MC version and Loader you are using
  Minecraft: 1.19.2
  Fabric Loader: 0.14.9
  Fabric API: 0.60.0
  Supplementaries: 2.2.3

• A description of your issue and how to reproduce
  Every time Ash block falls in the game this is printed to the log:

[18:24:04] [Server thread/ERROR]: Failed to handle entity type entity.supplementaries.falling_ash
[18:24:04] [Server thread/ERROR]: Failed to handle entity type entity.supplementaries.falling_ash

This will eventually spam the console if anything starts burning as blocks are replaced with Ash and turns into falling entities.

are you sure that's an error from vanilla? I cant find anything like that in the game code. needless to say I cant replicate

Ok, looks like this happens when Carpet Extra is installed. With just Fabric API, Supplementaries and Carpet the log is not spammed when Ash blocks are falling.

should be reported on their side as that error is logged by carpet mod so they should know what causes it

No other falling block's mod has a warning printed in the log when it falls.
Tested with Charm, Better Nether and Snow! Real Magic!. Snow! Real Magic! also has a similar falling entity for snow blocks as Ash block (has a layer property variable attached to it that is visible when it falls):

Ok, looks like this happens when Carpet Extra is installed. With just Fabric API, Supplementaries and Carpet the log is not spammed when Ash blocks are falling.

I'm having the same issue, but I didn't have Carpet Extra to begin with. Are you sure that it was that?

Minecraft Version: 1.19.2
Fabric Loader: 0.14.14
Fabric API: 0.73.2
Supplementaries: 2.2.50

Bug is work on 1.20.1 version :(

but is not on my end