(https://pubmed.ncbi.nlm.nih.gov/24923868/) This is about, unsurprisingly, the relationship between grammar when texting and results of scholastic grammar testing. The researchers find that there is no correlation between grammatical violations during texting and performance on scholastic grammar tests.

The actual title is, "Txt msg n school literacy: does texting and knowledge of text abbreviations adversely affect children's literacy attainment?" lol
Pretty much this paper is about the effect of "textisms" on children's literacy attainment. Interestingly, good literacy attainment is associated with greater use of textisms.