I noticed it in the 19w03a snapshot, but ignored it then. now that you have made several updates to it, and i still do not have the smoke signal particle effect showing up, i figure this must be a bug of some sort. I haven't found anyone else to be having this issue yet, but i do admit i could have missed it. If there is some work around i could do, or if i have to just wait, please let me know
Environment
Windows 10. Intel Core i7-770 cpu @3.60Hz 3.60 GHz
64-bit Operating system, x64 based processor
Java edition 13.1.2? it's the latest snapshot
Disable your resource pack(s). If that does not work, make sure your particles are enabled.