Need help to fix a Pluto downgrade when adding another package

Adding a package is downgrading Pluto, an MWE showing the error is shown below.
Can it be solved ? Or how to find out where to file an issue ?
Interpreting and resolving version conflicts is usually enough, but I’d need some help here.

pkg> activate --temp
(jl_RSzy0a) pkg> add CairoMakie
(jl_RSzy0a) pkg> add Pluto
(jl_RSzy0a) pkg> status
      Status `/tmp/jl_RSzy0a/Project.toml`
  [13f3f980] CairoMakie v0.8.5
  [c3e4b0f8] Pluto v0.19.8

# so far so good

(jl_RSzy0a) pkg> add QuantumOptics
  [6e0679c1] + QuantumOptics v1.0.4
...
  [34da2185] ↓ Compat v4.1.0 ⇒ v3.45.0
...
  [77ba4419] ↓ NaNMath v1.0.0 ⇒ v0.3.7

# In my real environment
# (CairoMakie, Combinatorics, DataFrames, HDF5, LaTeXStrings, MakieTeX,
#  OffsetArrays, Parameters, PhysicalConstants, PlutoExtracters, PlutoLinks,
#  PlutoUI, StatsBase, UnicodePlots, Unitful)
#  those downgrades trigger a downgrade of Pluto...

# now with --preserve=all
pkg> activate --temp

(jl_b6Cy3c) pkg> add CairoMakie

(jl_b6Cy3c) pkg> add Pluto

(jl_b6Cy3c) pkg> status
      Status `/tmp/jl_b6Cy3c/Project.toml`
  [13f3f980] CairoMakie v0.8.5
  [c3e4b0f8] Pluto v0.19.8

(jl_b6Cy3c) pkg> status -m NaNMath
      Status `/tmp/jl_b6Cy3c/Manifest.toml`
  [77ba4419] NaNMath v1.0.0

# found --preserve there (thanks !):
# https://discourse.julialang.org/t/it-takes-several-minutes-to-add-a-single-package/70704/7
(jl_b6Cy3c) pkg> add --preserve=all QuantumOptics
   Resolving package versions...
ERROR: Unsatisfiable requirements detected for package NLsolve [2774e3e8]:
 NLsolve [2774e3e8] log:
 ├─possible versions are: 4.0.0-4.5.1 or uninstalled
 ├─restricted by compatibility requirements with Reexport [189a3867] to versions: 4.5.1 or uninstalled
 │ └─Reexport [189a3867] log:
 │   ├─possible versions are: 0.2.0-1.2.2 or uninstalled
 │   └─restricted to versions 1.2.2 by an explicit requirement, leaving only versions 1.2.2
 ├─restricted by compatibility requirements with OrdinaryDiffEq [1dea7af3] to versions: 4.3.0-4.5.1, leaving only versions: 4.5.1
 │ └─OrdinaryDiffEq [1dea7af3] log:
 │   ├─possible versions are: 4.0.0-6.15.0 or uninstalled
 │   ├─restricted by compatibility requirements with QuantumOptics [6e0679c1] to versions: 4.0.0-6.15.0
 │   │ └─QuantumOptics [6e0679c1] log:
 │   │   ├─possible versions are: 0.5.5-1.0.4 or uninstalled
 │   │   ├─restricted to versions * by an explicit requirement, leaving only versions 0.5.5-1.0.4
 │   │   ├─restricted by compatibility requirements with Compat [34da2185] to versions: 0.6.0-1.0.4 or uninstalled, leaving only versions: 0.6.0-1.0.4
 │   │   │ └─Compat [34da2185] log:
 │   │   │   ├─possible versions are: 1.0.0-4.1.0 or uninstalled
 │   │   │   └─restricted to versions 4.1.0 by an explicit requirement, leaving only versions 4.1.0
 │   │   ├─restricted by compatibility requirements with FFTW [7a1cc6ca] to versions: [0.5.5, 0.6.6-1.0.4] or uninstalled, leaving only versions: 0.6.6-1.0.4
 │   │   │ └─FFTW [7a1cc6ca] log:
 │   │   │   ├─possible versions are: 0.1.0-1.4.6 or uninstalled
 │   │   │   └─restricted to versions 1.4.6 by an explicit requirement, leaving only versions 1.4.6
 │   │   └─restricted by compatibility requirements with Reexport [189a3867] to versions: [0.5.5-0.6.8, 0.8.3-1.0.4] or uninstalled, leaving only versions: [0.6.6-0.6.8, 0.8.3-1.0.4]
 │   │     └─Reexport [189a3867] log: see above
 │   ├─restricted by compatibility requirements with DataStructures [864edb3b] to versions: 5.42.4-6.15.0 or uninstalled, leaving only versions: 5.42.4-6.15.0
 │   │ └─DataStructures [864edb3b] log:
 │   │   ├─possible versions are: 0.9.0-0.18.13 or uninstalled
 │   │   └─restricted to versions 0.18.13 by an explicit requirement, leaving only versions 0.18.13
 │   ├─restricted by compatibility requirements with StaticArrays [90137ffa] to versions: 5.46.0-6.15.0 or uninstalled, leaving only versions: 5.46.0-6.15.0
 │   │ └─StaticArrays [90137ffa] log:
 │   │   ├─possible versions are: 0.8.0-1.4.7 or uninstalled
 │   │   └─restricted to versions 1.4.7 by an explicit requirement, leaving only versions 1.4.7
 │   └─restricted by compatibility requirements with Adapt [79e6a3ab] to versions: [4.0.0-5.39.1, 5.48.0-6.15.0] or uninstalled, leaving only versions: 5.48.0-6.15.0
 │     └─Adapt [79e6a3ab] log:
 │       ├─possible versions are: 0.3.0-3.3.3 or uninstalled
 │       └─restricted to versions 3.3.3 by an explicit requirement, leaving only versions 3.3.3
 └─restricted by compatibility requirements with LineSearches [d3d80556] to versions: uninstalled — no versions left
   └─LineSearches [d3d80556] log:
     ├─possible versions are: 7.0.0-7.1.1 or uninstalled
     └─restricted by compatibility requirements with NaNMath [77ba4419] to versions: uninstalled
       └─NaNMath [77ba4419] log:
         ├─possible versions are: 0.3.2-1.0.0 or uninstalled
         └─restricted to versions 1.0.0 by an explicit requirement, leaving only versions 1.0.0

Done with julia-1.7.3

It was LineSearches, and should be solved when PR #161 is merged.

It all makes sense to me now (IIUC):

The key sentence is “restricted by compatibility requirements with LineSearches”.
In the compat section, there is NaNMath = "0.3".

This restriction is incompatible with the NaNMath = "1.0.0" of another package
(which one it is not said, as there might be several).