PrimeFaces p:password unmask icon not showing. Look at html, it uses ui-password-icon. But the icon is not defined in jQuery UI themes. What css files need to be included?
<p:password ... toggleMask="true"/>
JQuery UI themes have been dead since about PrimeFaces 8.0
You are missing all the styles needed for toggleMask. Also for any new component introduced in PF8.0 or higher like ToggleSwitch, Skeleton, Avatar etc etc etc.
You would need to add those new styles yourself to your ThemeRoller theme. But I recommend getting off of ThemeRoller ASAP. Its dead and no longer supported