https://bugs.freedesktop.org/show_bug.cgi?id=99418
--- Comment #25 from Michel Dänzer michel@daenzer.net --- So maybe it actually depends on whether mutter uses DRI3 or DRI2? You can test this by enabling DRI3 on the server side but (re-)starting mutter with
LIBGL_DRI3_DISABLE=1 mutter --replace