Attention!
MKVToolNix (used in BD3D2MK3D) has removed features.
Quote:
# Version 20.0.0 "I Am The Sun" 2018-01-15
* Feature removal: several deprecated features have been removed:
...
* all command line tools: support for the deprecated, old, proprietary format
used for option files
...
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Now the __MUX_3D_OPTIONS file must be in JSON format. Don't update MKVToolNix files, or you have to change BD3D2MK3D.