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In toolbar module we have toolbar.settings.yml which contains the list of breakpoints provided by the toolbar module -
The breakpoint module does not actually look for this file (it picks up toolbar.breakpoints.yml - which also has the breakpoint configuration).
I may be wrong but it also seems like this is not used anywhere in the code as the breakpoint module will currently create a breakpoint group if one does not already exists, or, it will look for MODULE.breakpoint_groups.yml
Providing a patch which removes this seemingly redundant config file.