Console and log are being spammed with "Command Block chain tried to execute more than 65536 steps!" with "enable-command-block=false" in server.properties.

After enabling command blocks and restarting, the actual error from the command block is then also spammed with the chain error

Aug 06 14:40 [Server] WARN Couldn't load custom particle dust
Aug 06 14:40 [Server] INFO com.mojang.brigadier.exceptions.CommandSyntaxException: Expected ' ' at position 4: dust<–[HERE]
Aug 06 14:40 [Server] WARN Command Block chain tried to execute more than 65536 steps!

If command blocks are disabled, Minecraft should not be analyzing the command block chain at all.