runtime error: downcast of address … which does not point to an object of type 'InterfaceWindow'

Since commit 4f0ec5c3, just executing ./vlc causes this ASAN report on start:

../../modules/gui/qt/maininterface/mainui.cpp:152:60: runtime error: downcast of address 0x608000079ea0 which does not point to an object of type 'InterfaceWindow'
0x608000079ea0: note: object is of type 'QWidgetWindow'
 09 00 00 00  d0 d0 b9 5a 13 7f 00 00  c0 60 0a 00 20 61 00 00  f8 d1 b9 5a 13 7f 00 00  00 00 00 00
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'QWidgetWindow'

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