This appears to be a continuation of #26 ; commands get truncated no matter whether they are client side or not

I've confirmed this affects 1.19.3 specifically. This isn't directly related to 26, in the sense that 26 had to do with a change in the behavior of the mouseClicked method. After looking through the decompiled code, it appears that this is caused by an extra check for the length of the message before sending, which wasn't there previously.

I've just released v1.11.0, which fixes this!