Glitching with rangeArea and missing/null data

[levmason]

Description

I'm using rangeArea type, but whenever I have missing/null data points, the svg isn't drawn correctly. The glitch is different depending on whether I use smooth or straight curves. (I've attached screenshots of both below).

Steps to Reproduce

1. Create a rangeArea plot with a gap where data is missing (null values)

Screenshots

These screenshots all have line series plus a shaded rangeArea plot that should surround it. The more transparent colors are from the rangeArea series'.

straight curve

smooth curve

smooth curve

Reproduction Link

straight curve: https://codepen.io/Levi-Mason/pen/dygmaxe
smooth curve: https://codepen.io/Levi-Mason/pen/vYVRbqz

[DennisNurtio]

Might be related to: #3525

[mateuscardosogs]

same problem