n replaces newline in displayed docstrings when using interpolation

[tpapp]

With

using DocStringExtensions

"""
$(SIGNATURES)

Docstring

with

linebreaks
"""
foo() = nothing

when the point is at foo( (before the ()), the following docstring displayes in the message buffer:

$(SIGNATURES)nnDocstringnnwithnnlinebreaksn"

(note the ns). If I remove $(SIGNATURES), I just see the first line, ie Docstring.

Emacs 29.3, eglot-jl 20240318.1159 from MELPA.

[non-Jedi]

Linking my investigation of this for whenever I get around to figuring out which upstream should handle the bug:

https://discourse.julialang.org/t/using-languageserver-jl-with-eglot-in-emacs/23125/105