Thanks for reporting !
Bug as well exists on current master.
Only an issue for remote locations, because no folder/file monitors are available there. Pressing F5 will update the view manually and show the correct icon.
The rename is e.g. triggered in "thunar_standard_view_action_rename" inside thunar-standard-view.h
It would be good to call "thunar_file_reload" if the GFileMonitor of this file is NULL ( probably we need a method on ThunarFile to check that .. similar to thunar_folder_has_folder_monitor on ThunarFolder ).
yes, probably as well required on other operations .. (e.g. update folder on paste and cut .. probably whenever a custom action was triggered ) to be checked in detail
Still works here, no matter which thumbnail setting ... possibly you have some special thumbnailer installed for pdf or html? Can you reproduce with other endings? Could you maybe as well test this one on a clean user account?