Can't figure out subtitles

[Geomancer]

I generally do not use subtitles, but this particular video switches between Japanese points of view and American points of view, but during the Japanese segments there are no subtitles so can't understand what they're saying.

They work seamlessly in VLC.

I loaded up some other content just to quickly look, most do not have the CC button, but a few do. I'd say that 99% of what I watch though is in English, so don't need subtitles and don't want them. So can't say it's unique to this file in particular, because it isn't something I encounter often.

Tora! Tora! Tora! (1970)
Container: mkv
Path: D:\Movies\Tora! Tora! Tora! (1970).mkv
Size: 8430 MB

Video
Title: Tora.Tora.Tora.1970
Codec: HEVC
AVC: No
Profile: Main 10
Level: 120
Resolution: 1920x820
Aspect ratio: 2.35:1
Anamorphic: No
Interlaced: No
Framerate: 23.976025
Bitrate: 7915 kbps
Bit depth: 10 bit
Video range: SDR
Video range type: SDR
Pixel format: yuv420p10le
Ref frames: 1

Audio
Title: Dolby Digital Plus 5.1 - English - Dolby Digital+ - Default
Language: eng
Codec: EAC3
AVC: No
Layout: 5.1
Channels: 6 ch
Bitrate: 768 kbps
Sample rate: 48000 Hz
Default: Yes
Forced: No
External: No

Audio
Title: Commentary by director Richard Fleisher and Japanese film historian Stuart Galbraith IV - English - AAC - Stereo - Default
Language: eng
Codec: AAC
AVC: No
Profile: HE-AAC
Layout: stereo
Channels: 2 ch
Bitrate: 192 kbps
Sample rate: 48000 Hz
Default: Yes
Forced: No
External: No

Image
Codec: MJPEG
AVC: No
Profile: Baseline
Resolution: 531x800
Bit depth: 8 bit
Color space: bt470bg
Pixel format: yuvj444p
Ref frames: 1