I tried again using Tasker Bluetooth Info, and verified it (also the apparently similar Tasker Profiles) will not work with some iBeacons. If the iBeacon happens to be winked off at the end of the scan (as many iBeacons do to save power), Tasker does not report it at all, even though it was winked on sometime during the scan.
Comparison of apps such as BLE-Scanner with Tasker give different results for these intermittent devices. Apps such as BLE-Scanner say it's winked on much of the time, yet Tasker sometimes reports it as not existing any longer.
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Google Play says the Bluetask plugin was last updated only half a year ago. Similarly named packages are also available for Windows and MacOS from several software distribution websites. And BaldApps develops at least a dozen other packages besides Bluetask. So it would surprise me if it's not developed any more.