Legend marker does not appear when first y value is NaN on scatter

[LilithHafner]

Details

For example, scatter(1:3, [NaN, 2, 3]) produces

While scatter(1:3, [1, NaN, 3]) produces

in Atom.

Backends

This bug occurs on ( insert x below )

Backend	yes	no	untested
gr (default)	x
pyplot			x
plotlyjs			x
pgfplotsx			x
unicodeplots			x
inspectdr			x
gaston			x

Versions

Plots.jl version: [91a5bcdd] Plots v1.23.6
Backend version (]st -m <backend(s)>):
pkg> st -m gr
No Matches in ~/.julia/dev/all/Manifest.toml
Output of versioninfo():

Julia Version 1.7.0
Commit 3bf9d17731 (2021-11-30 12:12 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin19.5.0)
  CPU: Intel(R) Core(TM) i5-8210Y CPU @ 1.60GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-12.0.1 (ORCJIT, skylake)
Environment:
  JULIA_EDITOR = atom  -a
  JULIA_NUM_THREADS = 2