Beamer, standard overlay specification, references Problem

[Wolfgang Engelmann]

If I use in beamer a frame with standard overlay specification and 
references, instead of the second reference the first one is shown 
again. Taking out the standard overlay specification is a remedy. If I 
need to use the standard overlay specification, is there a way to 
circumvent this?
Look at the TEST.lyx and export to pdf > the error occurs
put the standard overlay specification in a note or take it off > no error
I use LyX Version 2.3.4
(Sonntag, 12. Januar 2020)
Systemverzeichnis: /usr/share/lyx/
Benutzerverzeichnis: ~/.lyx/
Qt-Version (Laufzeit): 5.12.5
Qt-Version (bei Erstellung): 5.12.5

Wolfgang
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