After my engineer applied an updated theme, exported via Material UI Sync, all of the buttons disappeared. The button component has some new style overrides I haven't seen before and didn't intent to apply:

"&:not(.Mui-disabled):not(.Mui-focusVisible):not(:hover)": {

"color": "var(--mui-palette-action-disabled)",

"border": "1px solid var(--mui-palette-action-disabledBackground)",

"background": "none",

"display": "none"

},

Any ideas how I might have changed the button component for the theme to generate this way? Any thoughts on how I could fix this? Thanks!