This is pretty surprising, and makes Garmin look even more desparate these days. New firmware for some handheld devices is intentionally disabling routing on OSM maps - this could affect some of the maps here at gpsfiledepot. For example, see this eTrex firmware update changelog:
https://www8.garmin.com/support/download_details.jsp?id=14889
More information in this thread
https://forums.geocaching.com/GC/index.php?/topic/361134-gpsmap-64-or-65/&do=findComment&comment=5880241