Tor Browser window size changes with Windows 10 display scaling (e.g. 125% --> 998x999)

Unfortunately, the reported Tor Browser Window size (i am using panopticlick.eff.org ) changes if i change the Windows 10 display scaling from 100% to e.g. 150%:

reported values:

100% --> 1000x1000x24

125% --> 998x999x24

150% --> 999x800x24

this is bad because it reduces anonymity..

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