Bugs when turning the "FM" button in "OpulenZ" on or off while playing notes.

Windows 10 Pro, 64-bit OS, x64-based processor with LMMS 1.2.0-rc.3

Bug 1: Turning the "FM" button in "OpulenZ" off while playing notes causes distortion that fades out with time.
Images:
The oscilloscope before turning the button off:

The oscilloscope after turning the button off. It's supposed to look like the first image in the second images below, but it doesn't:

Project file: Bug 1.zip

Bug 2: Turning the "FM" button in "OpulenZ" on while playing notes doesn't modulate "OP2" by "OP1" that way it's supposed to.
Images:

The oscilloscope before turning the button on:

The oscilloscope after turning the button on. It's supposed to look like the first image in the first images above, but it doesn't:

Project file: Bug 2.zip

Both of the bugs will go away when playing a new note or looping the same note.
Both of the bugs were first produced with a custom preset then re-produced with the default "OpulenZ" preset in an empty project.

Start by reproducing both cases in LMMS 1.2.0-rc.3 with the attached Bug 1.zip and Bug 2.zip projects, toggling the OpulenZ FM button while notes play. Trace the OpulenZ implementation from that behavior; done means turning FM off no longer produces fading distortion and turning it on modulates OP2 by OP1 immediately, with verification against the described oscilloscope results.