suddenly \markup raises an error

[Ursus Kirk]

The following snippet suddenly raises an error 'Mark-up outside 
tekstscript or \lyricmode'. It has never ever done so before. Has 
something changed? Win10

\version "2.24.3"
\header {
  tagline = ##f
}

global = {
  \key c \major
  \time 4/4
}

notes = \relative c'' {
  \global
 a1\markup{"NOW"}
}

\score {
  \new Staff  { \notes}
  \layout { }
}


--
Met vriendelijke groet,
Erik Appeldoorn