why do zhonya's (5s), wooglet's (3s) and stopwatch not lock eachother out?

Normally unique named effects can't be used together, but stopwatches and wooglets/zhonyas can. Is this really intended? It goes against the normal rules forr identically named effects (two different items with the same named effect don't stack) And quite frankly, it's BS that anybody could stasis twice in the same fight, even if they had to pay a significant amount to do so.
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