I can still reproduce this behavior. Indeed Bug 1658043 seems to be the better candidate for causing this regression (tried with the last release without & first release with from https://hg.mozilla.org/mozilla-central/rev/9d3ade989dabfcdf2a63e1c9b71edcf27ea48c50) I'm going to update this Bug to better reflect this. Thank you Olli ! And sorry for pointing out the wrong issue !
Bug 1659470 Comment 7 Edit History
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I can still reproduce this behavior. Indeed Bug 1658043 seems to be the better candidate for causing this regression (tried with the last release without & first release with from https://hg.mozilla.org/mozilla-central/rev/9d3ade989dabfcdf2a63e1c9b71edcf27ea48c50) I'm going to update this Bug to better reflect this. Thank you Olli ! And sorry for pointing out the wrong patch!