Created attachment 167834 [details] demonstration video The way LibreOffice's "GroupedBar Compact" toolbar mode determines when to overflow items to a ">>" menubutton changes when you click that button. See the attached video for a clear demonstration of the bug. This is LibreOffice 7, GTK version, running on Fedora 33.
*** Bug 123415 has been marked as a duplicate of this bug. ***
I reproduce with 7.0, but not with 7.4, so I will close this. Arch Linux 64-bit Version: 7.4.0.0.alpha0+ / LibreOffice Community Build ID: 678446780446ae568ee8b1b814158c54ea5e393f CPU threads: 8; OS: Linux 5.17; UI render: default; VCL: gtk3 Locale: fi-FI (fi_FI.UTF-8); UI: en-US Calc: threaded Jumbo Built on 1 April 2022