diff --git a/src/testdir/dumps/Test_modify_text_before_prop_1.dump b/src/testdir/dumps/Test_modify_text_before_prop_1.dump
new file mode 100644
index 0000000..87305d4
--- /dev/null
+++ b/src/testdir/dumps/Test_modify_text_before_prop_1.dump
@@ -0,0 +1,5 @@
+| +0#af5f00255#ffffff0@1|1| >t+0#0000000&|e|s|t|_|w|o|r|d|s|a+0&#ffd7ff255@45
+| +0#af5f00255#ffffff0@3|a+0#0000000#ffd7ff255@18| +0&#ffffff0@36
+| +0#af5f00255&@3|a+0#4040ff13&@54|…
+| +0#af5f00255&@1|2| |s+0#0000000&|e|c|o|n|d| |l|i|n|e| @44
+@42|1|,|1| @10|T|o|p| 
diff --git a/src/testdir/dumps/Test_modify_text_before_prop_2.dump b/src/testdir/dumps/Test_modify_text_before_prop_2.dump
new file mode 100644
index 0000000..9dc87a4
--- /dev/null
+++ b/src/testdir/dumps/Test_modify_text_before_prop_2.dump
@@ -0,0 +1,5 @@
+| +0#af5f00255#ffffff0@1|1| >a+0#0000000&|s|t|_|w|o|r|d|s|a+0&#ffd7ff255@46
+| +0#af5f00255#ffffff0@3|a+0#0000000#ffd7ff255@17| +0&#ffffff0@37
+| +0#af5f00255&@3|a+0#4040ff13&@54|…
+| +0#af5f00255&@1|2| |s+0#0000000&|e|c|o|n|d| |l|i|n|e| @44
+@42|1|,|1| @10|T|o|p| 
diff --git a/src/testdir/test_textprop.vim b/src/testdir/test_textprop.vim
index 9cf46d7..dcb408c 100644
--- a/src/testdir/test_textprop.vim
+++ b/src/testdir/test_textprop.vim
@@ -3979,6 +3979,28 @@
   call StopVimInTerminal(buf)
 endfunc
 
+func Test_modify_text_before_prop()
+  CheckRunVimInTerminal
+
+  let lines =<< trim END
+      vim9script
+      setline(1, ['test_words', 'second line', 'third line', 'fourth line'])
+      set number
+      prop_type_add('text', {highlight: 'DiffChange'})
+      prop_type_add('below', {highlight: 'NonText'})
+      prop_add(1, 11, {type: 'text', text: repeat('a', 65)})
+      prop_add(1, 0, {type: 'below', text: repeat('a', 65), text_align: 'below'})
+  END
+  call writefile(lines, 'XtextPropModifyBefore', 'D')
+  let buf = RunVimInTerminal('-S XtextPropModifyBefore', #{rows: 5, cols: 60})
+  call VerifyScreenDump(buf, 'Test_modify_text_before_prop_1', {})
+
+  call term_sendkeys(buf, "xxia\<Esc>")
+  call VerifyScreenDump(buf, 'Test_modify_text_before_prop_2', {})
+
+  call StopVimInTerminal(buf)
+endfunc
+
 func Test_overlong_textprop_above_crash()
   CheckRunVimInTerminal