TYPO3 Core

During a migration to type 3 4.2, I encountered the following issue:
in my typsocript I had:
ib.langsel = HMENU
lib.langsel.special = language
lib.langsel.special.value = 0,2,5
lib.langsel.1 = GMENU
#Liens vers les langages existants.
lib.langsel.1.NO {
XY = [5.w]+4, [5.h]+4
backColor = #2a1909
allWrap = |
5 = IMAGEgif || media/flags/flag_uk.gif || media/flags/flag_de.gif
5.offset = 2,2
5.file = media/flags/flag_fr.
}
#Affichage du langage en cours
lib.langsel.1.ACT < lib.langsel.1.NO
lib.langsel.1.ACT=1
lib.langsel.1.ACT.backColor = #e9dcc2
#Masquer les langages inexistants
lib.langsel.1.USERDEF1 < lib.langsel.1.NO
lib.langsel.1.USERDEF1 = 1
lib.langsel.1.USERDEF1.XY = 0, 0

I had to replace the
XY = [5.w]+4, [5.h]+4
by
XY = 24, 16, since it seems typoscript is not able anymore to retrieve the width and length information from the maniupulated images.

(issue imported from #M8304)