Yes, that was discontinued. Possibly because of how often settings are changed from one version to the next. I wonder if there is a workaround though.
I am forever mentioning that I keep presets in a central location in a My Documents folder, and place a shortcut to that folder in the relevant preset folder. This lets me share the same presets between all versions (current release, beta and 22.2 for Lighting Effects), and keeps them safe from major update glitches. I wonder if you could make that central location in one of the numerous cloud storage locations we seem to have nowadays? I can't think why not, but I suspect it would give you a performance hit.
Can you tell us any more about the particular watercolor brushes you have lost?
How long ago did you lose them? If recently, then check the previous version.
C:\Users\[Your User Name]\AppData\Roaming\Adobe\Adobe Photoshop 2025\Presets