diff --git a/autotests/export/latex/lyxbugs/12734-unicode-math.lyx b/autotests/export/latex/lyxbugs/12734-unicode-math.lyx
new file mode 100644
index 0000000000..c063d37bd6
--- /dev/null
+++ b/autotests/export/latex/lyxbugs/12734-unicode-math.lyx
@@ -0,0 +1,102 @@
+#LyX 2.4 created this file. For more info see https://www.lyx.org/
+\lyxformat 615
+\begin_document
+\begin_header
+\save_transient_properties true
+\origin unavailable
+\textclass article
+\use_default_options true
+\maintain_unincluded_children no
+\language english
+\language_package default
+\inputencoding auto-legacy
+\fontencoding auto
+\font_roman "default" "default"
+\font_sans "default" "default"
+\font_typewriter "default" "default"
+\font_math "auto" "default"
+\font_default_family default
+\use_non_tex_fonts true
+\font_sc false
+\font_roman_osf false
+\font_sans_osf false
+\font_typewriter_osf false
+\font_sf_scale 100 100
+\font_tt_scale 100 100
+\use_microtype true
+\use_dash_ligatures true
+\graphics default
+\default_output_format default
+\output_sync 0
+\bibtex_command default
+\index_command default
+\float_placement class
+\float_alignment class
+\paperfontsize default
+\spacing single
+\use_hyperref false
+\papersize default
+\use_geometry false
+\use_package amsmath 1
+\use_package amssymb 1
+\use_package cancel 1
+\use_package esint 0
+\use_package mathdots 1
+\use_package mathtools 1
+\use_package mhchem 1
+\use_package stackrel 1
+\use_package stmaryrd 1
+\use_package undertilde 1
+\cite_engine basic
+\cite_engine_type default
+\biblio_style plain
+\use_bibtopic false
+\use_indices false
+\paperorientation portrait
+\suppress_date false
+\justification true
+\use_refstyle 1
+\use_minted 0
+\use_lineno 0
+\index Index
+\shortcut idx
+\color #008000
+\end_index
+\secnumdepth 3
+\tocdepth 3
+\paragraph_separation indent
+\paragraph_indentation default
+\is_math_indent 0
+\math_numbering_side default
+\quotes_style english
+\dynamic_quotes 0
+\papercolumns 1
+\papersides 1
+\paperpagestyle default
+\tablestyle default
+\tracking_changes false
+\output_changes false
+\change_bars false
+\postpone_fragile_content false
+\html_math_output 0
+\html_css_as_file 0
+\html_be_strict false
+\docbook_table_output 0
+\docbook_mathml_prefix 1
+\end_header
+
+\begin_body
+
+\begin_layout Standard
+\begin_inset Formula 
+\[
+\overrightarrow{\mathscr{P}}
+\]
+
+\end_inset
+
+
+\end_layout
+
+\end_body
+\end_document
diff --git a/development/autotests/invertedTests b/development/autotests/invertedTests
index c1011e8bee..23d7f03892 100644
--- a/development/autotests/invertedTests
+++ b/development/autotests/invertedTests
@@ -88,6 +88,9 @@ export/export/latex/languages/nested-inputenc_auto-legacy_pdf2
 # - This test is usually inverted, but it works with the DocBook backend.
 !export/export/latex/lyxbugs/3059-language-in-tables_docbook5
 !export/export/latex/lyxbugs/12708-refstyle-amsmath_docbook5
+# - The issue is only with XeTeX
+!export/export/latex/lyxbugs/12734-unicode-math_(docbook5|dvi|pdf[235]).*
+!export/export/latex/lyxbugs/12734-unicode-math_pdf
 
 # ================================================
 Sublabel: lyxbugs