I might be wrong or expecting to much.
When using a document with 16 or 32 bit color depth, and 16-bit colors in color panel,
i would expect beeing able to enter 16-bit values to RGBHEX. But it will only accept 00-FF (8 bit) and always replace the "high" byte with 00.
The "resulting" color code from all 3 channels will simply double/repeat the given 8-bit hex value. This is at least confusing, or a bug.
HSL or LAB do not offer any option to enter 16-bit values.
And last but not least, the info panel is completely unable to show 16-bit colors. All you get is either 8-bit or less than 7-bit if using % (0-100%).
Only option to enter 16-bit is using RGB or greyscale.
Only option to display 16-bit color value is to use color picker, and read out result in color panel.