Fixing Subtitles Not Immediately Appearing When Seeking

Heyo! I’ve got some anime MKVs that I watch with subtitles. I use MPC-HC. When seeking, either by clicking directly on the seekbar or by using the arrow keys, the subtitle don’t appear for what the character is currently saying. They only appear once the next subtitle happens. I thought this was an MPC-HC bug, but according to this github report, it’s actually an issue with the subtitles in the video. clsid2 said that it’s possible to fixed by remuxing in MkvToolNix, but I can’t seem to fix the problem. Does anybody know how to fix this? Cheers!