If you use mpv: no action needed.
If you use MPC-HC: install version 2.4.0 or later. Go to Options > Playback > Output and switch the DirectShow Video setting to MPC Video Renderer.
If you use VLC: switch to a different player.
If you use mpv: no action needed.
If you use MPC-HC: install version 2.1.3 or later. Go to Options > Subtitles > Default Style and check the "Use libass for SSA/ASS" box in the bottom right. Make sure that in Options > Playback > Output, your subtitle renderer is set to Internal Subtitle Renderer.
If you use VLC: switch to a different player. Or at least update to 3.0.18.
Link to MPC-HC: https://github.com/clsid2/mpc-hc/releases/tag/2.6.4
Link to mpv: https://mpv.io/