The UNO command ".uno:UnhainFrames" seems to bear a typo. https://opengrok.libreoffice.org/xref/core/officecfg/registry/data/org/openoffice/Office/UI/WriterCommands.xcu?r=6320a4c2#2639 and, in /workdir/SdiTarget/sw/sdi/swslots.hxx we have // Slot Nr. 59 : 21737 SFX_NEW_SLOT_ARG( SwFrameShell,FN_FRAME_UNCHAIN,SfxGroupId::Frame, &aSwFrameShellSlots_Impl[1] /*Offset Next*/, SFX_STUB_PTR(SwFrameShell,Execute),SFX_STUB_PTR(SwFrameShell,GetState), SfxSlotMode::AUTOUPDATE|SfxSlotMode::RECORDPERSET|SfxSlotMode::MENUCONFIG|SfxSlotMode::TOOLBOXCONFIG|SfxSlotMode::NONE, SfxDisableFlags::SwOnProtectedCursor, SfxVoidItem, 20/*Offset*/, 0, SfxSlotMode::NONE,"UnhainFrames" ),
Just Opengroking, I could confirm this.
I gave a try with https://gerrit.libreoffice.org/c/core/+/158328 but hope we can do this and not stuck because of existing profile or anything.
Finally added in https://wiki.documentfoundation.org/Development/stuck_stuff I can't help here so unassign myself.
If this commit could not be merged, and this exception was added already in stuck list, could this bug be closed? There is nothing to do about it.