https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66139
--- Comment #11 from Xi Ruoyao <ryxi at stu dot xidian.edu.cn> --- This happens for all TARGET_EXPRs with the third operand (cleanup expression), as an INIT_EXPR's rhs. The cleanup sequence are pushed in gimplify_target_expr, which doesn't handle TARGET_EXPRs as the INIT_EXPRs' rhs. So they just go missing.
