For some reason the {thumbnail} code only works once for icons on the infotips when I hover over them. If I hover over them once it shows the icon, but if I do it again it'll not show it a second time.
Seems fine here.
Directory Opus Pro 12.9.4 (Beta) Build 6836 x64
OS 10.0 (B:17134 P:2 T:1) SP 0.0