I've read the math section in the User Guide and am working my way through
the separate math manual.

Attached is a MWE. The first line (if the only one in the document) compiles
using pdflatex. The second line causes a build error because a code point
(0xfffc) is detected. The font encoding is unicode utf8.

What's the difference causing this discrepancy? How do I write the second
line so it builds without complaint?

TIA,

Rich
#LyX 2.3 created this file. For more info see http://www.lyx.org/
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\begin_header
\save_transient_properties true
\origin unavailable
\textclass scrreprt
\begin_preamble
\date{}
%\usepackage{ftnxtra}
\usepackage{mathpazo,amssymb}
\usepackage{graphicx,relsize}
\usepackage{scrlayer-scrpage}
\usepackage{xcolor,colortbl}
\usepackage{chngcntr,xurl}
\counterwithout{figure}{section}
\definecolor{lightgray}{gray}{0.8}
\pagestyle{scrheadings}
\lehead{Biological Evaluation}
\rohead{Biological Evaluation}
\refoot{Applied Ecosystem Services, LLC}
\lofoot{Applied Ecosystem Services, LLC}
%\automark*{sections}
\end_preamble
\use_default_options true
\maintain_unincluded_children false
\language english
\language_package default
\inputencoding auto
\fontencoding global
\font_roman "palatino" "default"
\font_sans "avant" "default"
\font_typewriter "libertine-mono" "default"
\font_math "auto" "auto"
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\font_tt_scale 100 100
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\bibtex_command biber
\index_command default
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\use_package amsmath 1
\use_package amssymb 1
\use_package cancel 1
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\secnumdepth 2
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\math_numbering_side default
\quotes_style english
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\papercolumns 1
\papersides 1
\paperpagestyle plain
\tracking_changes false
\output_changes false
\html_math_output 0
\html_css_as_file 0
\html_be_strict false
\end_header

\begin_body

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For example, 
\begin_inset ERT
status open

\begin_layout Plain Layout

$
\backslash
bar x = x_1, x_2, 
\backslash
dots, x_n$
\end_layout

\end_inset


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\begin_layout Standard
Similarly, the mean of a sample 
\begin_inset ERT
status open

\begin_layout Plain Layout

$
\backslash
bar x = x_1, x_2, 
\backslash
dots, x_n$
\end_layout

\end_inset

,
\end_layout

\end_body
\end_document
#LyX 2.3 created this file. For more info see http://www.lyx.org/
\lyxformat 544
\begin_document
\begin_header
\save_transient_properties true
\origin unavailable
\textclass scrreprt
\begin_preamble
\date{}
%\usepackage{ftnxtra}
\usepackage{mathpazo,amssymb}
\usepackage{graphicx,relsize}
\usepackage{scrlayer-scrpage}
\usepackage{xcolor,colortbl}
\usepackage{chngcntr,xurl}
\counterwithout{figure}{section}
\definecolor{lightgray}{gray}{0.8}
\pagestyle{scrheadings}
\lehead{Biological Evaluation}
\rohead{Biological Evaluation}
\refoot{Applied Ecosystem Services, LLC}
\lofoot{Applied Ecosystem Services, LLC}
%\automark*{sections}
\end_preamble
\use_default_options true
\maintain_unincluded_children false
\language english
\language_package default
\inputencoding utf8
\fontencoding global
\font_roman "palatino" "default"
\font_sans "avant" "default"
\font_typewriter "libertine-mono" "default"
\font_math "auto" "auto"
\font_default_family default
\use_non_tex_fonts false
\font_sc false
\font_osf false
\font_sf_scale 100 100
\font_tt_scale 100 100
\use_microtype false
\use_dash_ligatures true
\graphics default
\default_output_format default
\output_sync 0
\bibtex_command biber
\index_command default
\paperfontsize 11
\spacing single
\use_hyperref false
\papersize letterpaper
\use_geometry true
\use_package amsmath 1
\use_package amssymb 1
\use_package cancel 1
\use_package esint 0
\use_package mathdots 0
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\use_package mhchem 1
\use_package stackrel 1
\use_package stmaryrd 1
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\paperorientation portrait
\suppress_date false
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\index Index
\shortcut idx
\color #008000
\end_index
\leftmargin 0.75in
\topmargin 0.5in
\rightmargin 0.5in
\bottommargin 0.5in
\secnumdepth 2
\tocdepth 2
\paragraph_separation indent
\paragraph_indentation default
\is_math_indent 0
\math_numbering_side default
\quotes_style english
\dynamic_quotes 0
\papercolumns 1
\papersides 1
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\tracking_changes false
\output_changes false
\html_math_output 0
\html_css_as_file 0
\html_be_strict false
\end_header

\begin_body

\begin_layout Standard
For example, 
\begin_inset ERT
status open

\begin_layout Plain Layout

$
\backslash
bar x = x_1, x_2, 
\backslash
dots, x_n$
\end_layout

\end_inset


\end_layout

\begin_layout Standard
Similarly, the mean of a sample 
\begin_inset ERT
status open

\begin_layout Plain Layout

$
\backslash
bar x = x_1, x_2, 
\backslash
dots, x_n$
\end_layout

\end_inset

,
\end_layout

\end_body
\end_document
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