Thanks, real.finder for the report. scale_inputs "float" with input bit depth integer was misinterpreted. r2721 fixes that problem.
AviSynth+ r2721 test build (hopefully one of the last tests):
https://drive.google.com/open?id=1Qk...wN9QyQMK-vHhG6
Matching masktools2 2.2.15 test 5 (not changed since last version)
https://drive.google.com/open?id=1H0...0hVlXCwd2c-afI