FWIW, I can reproduce this issue on default-configured Fenix as well (which I believe has tracking protection enabled by default and uses geckoview, so it's functionally equivalent to Reference Browser, from this bug's perspective).
Bug 1530050 Comment 2 Edit History
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FWIW, I can reproduce this issue on default-configured Fenix as well (which I believe has tracking protection enabled by default and uses geckoview, so it's functionally equivalent to Reference-Browser-with-Tracking-Protection, from this bug's perspective).