Unable to package multiple files with Widevine DRM using raw key

[ems5647]

OS: Windows 10 Enterprise
Packager version: v2.6.1-634af65-release

packager in=inputPath,stream=audio,init_segment=parentFolder/audio[index]/init.mp4,segment_template=parentFolder/audio/$Number$.m4s
in=inputPath,stream=video,init_segment=parentFolder/audio[index]/init.mp4,segment_template=parentFolder/video/$Number$.m4s
--segment_duration 10
--protection_scheme cenc
--enable_raw_key_encryption
--keys key_id=keyID:key=key
--clear_lead 0
--protection_systems Widevine
--generate_static_live_mpd
--mpd_output mpdOutputPath

(1) Same command works when packaging to single file MP4 but when using segment_template to split into m4s, it no longer encrypts the videos

Expected result: Folder with output mpd and a folder each for audio and video that contain multiple files for each segment. Audio and video files should be encrypted with Widevine DRM.

Actual result: Everything is correct except there is no DRM.