Tags - Tags disappear in Finder and colors don't work

I'm using Tahoe 26.0.1 on a MacBook Pro 16-inch, purchased in April 2025.

Problem 1:

The Finder correctly displays the colored Tags dots in the bottom left sidebar. If I add a Tag to a folder and then click the Tags dot in the Finder sidebar, it doesn't display the folders for that Tag.

Sometimes it works for a few hours, then all the Tags disappear.

Folders still have the chosen Tags, even after hours or days, but they don't appear when I click the Tags in the Finder.

Problem 2:

Folders with Tags aren't always colored.

Sometimes as soon as I add a Tag to a folder, it becomes colored, then after a few hours, it disappears. The colored Tag dot on the folder is still visible, but the folder itself has the default color.