Wrong command message: Last character of NBT parsing error message is missing

If you write:

/summon area_effect_cloud ~ ~ ~ {Particle:flame,Radius:3f,Duration:10} force

the fail message is only:

{Particle:flame,Radius:3f,Duration:10} forc

the word 'force' is only writen 'forc', missing the last character.

Code analysis by Marcono1234 in this comment.