weardest shit i think i ever saw on plant first i looked it that must be ''dead'' bug, then i touched it wtf its super hard. then i cutted it half and no bug juice looked more like cutted wood but like polypore/wood hard kind of little gummy at top maybe but you could not crush it with fingers
It looks like it could have been some type of insect egg sac. They are kind of a foamy almost wood like consistency and hardness. Preying mantis's are kind of block shaped