Yes, the problem occurs when doing the manual restores. And the problem is always reproduced. The problem does not occur if enabled `Open previous windows and tabs` in about:preferences. The average user probably has this option enabled. So, maybe nobody has found the problem.
Bug 1822854 Comment 4 Edit History
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Yes, the problem occurs when doing the manual restores. And the problem is always reproduced. All tabs (pinned and normal tabs) are restored after restart browser if enabled `Open previous windows and tabs` in about:preferences. The average user probably has this option enabled. So, maybe nobody has found the problem.