Regression, MediaPlayer Classic MPC HC 1.7.13, part of the GUI is not drawn at all, is transparent

MediaPlayer Classic HomeCinema MPC HC 1.7.13 from rapps
does not draw part of its GUI, reproducibly, no matter what I do.
Dragging offscreen and back does not fix it.

Observed result
0.4.13-RC-38-g3803e58_MPC.webm
0.4.13-RC-38-g3803e58_MPC.log

Expected result
As I thought: It's a regression,
0.4.13-dev-2-g88f899e_was_still_ok.png
0.4.13-dev-2-g88f899e_was_still_ok.log

RegressionTest
0.4.13-RC-38-g3803e58
reactos-bootcd-0.4.13-dev-650-g34bf247-x86-gcc-lin-dbg.iso
reactos-bootcd-0.4.13-dev-369-g7eead93-x86-gcc-lin-dbg.iso
reactos-bootcd-0.4.13-dev-240-gc4e2826-x86-gcc-lin-dbg.iso
reactos-bootcd-0.4.13-dev-220-g0bcf434-x86-gcc-lin-dbg.iso
reactos-bootcd-0.4.13-dev-210-g3a207cd-x86-gcc-lin-dbg.iso
reactos-bootcd-0.4.13-dev-208-g94b4b5c-x86-gcc-lin-dbg.iso GUILTY
reactos-bootcd-0.4.13-dev-207-ge1e6cfd-x86-gcc-lin-dbg.iso
reactos-bootcd-0.4.13-dev-205-gbd7b0c9-x86-gcc-lin-dbg.iso
reactos-bootcd-0.4.13-dev-200-gea7aca8-x86-gcc-lin-dbg.iso
reactos-bootcd-0.4.13-dev-160-gebd39aa-x86-gcc-lin-dbg.iso
reactos-bootcd-0.4.13-dev-2-g88f899e-x86-gcc-lin-dbg.iso