Perspective Power Chart caches the range brush area

Ignition 8.3.9 Perspective

I add a pen to the chart in X Trace mode. I switch to range brush and create a range . then I try to load a saved trend into the chart. Before I load the saved trend, I change the chart mode to Xtrace and clear the range brush data .
however the trend itself seems to be caching the range area somehow. If I reload the page the range is gone .
Is this is a known issue? or am I missing something

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