Build number: 13493.1921376
Xu chu still has the bug where his ability "Stalwart defender" only applies to his allies and not to him. I might have thought it as intentional if not for the description mentioning that "Xu chu shrugs off attacks as if they were nothing" implying that this ability should either be only applied to him or work on him together with his allies.
Reproduction steps are easy, just get Xu Chu at any campaign and have him to the level where he can unlock Stalwart defender (Usually level 3), then just get him in battle and look at which generals have the stalwart defender buff and which don't. (spoiler alert any general within his radius range has it and xu chu himself doesn't).
Don't think i need to provide .save file as this is an issue i had for several campaigns over the course of 3 kingdoms life span. So its not a one of a kind situation.