tcl-8_6 was updated in 4fb92ae60d from 8.6.9 -> 8.6.11 but tk's hash wasn't updated at the same time, which means the current hash was still from tk 8.6.9 rather than 8.6.11. (cherry picked from commit d9bf02324af69a6543a3c5131f4a0f58cea6567a)
4fb92ae60d