Xylan acetyltransferase required for 2-O- and 3-O-monoacetylation of xylosyl residues in xylan (PubMed:29569182, PubMed:27864442). Catalyzes the 2-O-acetylation of xylan, followed by nonenzymatic acetyl migration to the O-3 position, resulting in products that are monoacetylated at both O-2 and O-3 positions (By similarity). Stunted growth and reduced plant height (PubMed:27864442). The double mutants tbl1 and tbl2 exhibit increased susceptibility to the bacterial pathogen Xanthomonas oryzae pv oryzae (Xoo) (PubMed:27864442). Belongs to the PC-esterase family. TBL subfamily.