Weird issue with multiline config overrides

[pellcorp]

So lets take an example:

[z_tilt]
z_positions: 0, 200
    400, 200
points: 20, 200
    380, 200
speed: 50
horizontal_move_z: 5
retries: 3
retry_tolerance: 0.2

Config overrides will generate a difference of:

[z_tilt]
z_positions:
    400, 200
points:
    380, 200
speed: 50
horizontal_move_z: 5
retries: 3
retry_tolerance: 0.2

Note it misses the first two values for z_positions and points because they are on the same line, not really sure if this is a configupdater python module issue or something I need to change the way I am generating config overrides.