Backport preloading trait fixup fixes

This cherry-picks 33969c2252b2c33a72c9039072af8862fd347a5f and
2effbfd8713936742ef46e6e85ce193b320ac005 from PHP-8.0.

The issues these comm

Backport preloading trait fixup fixes

This cherry-picks 33969c2252b2c33a72c9039072af8862fd347a5f and
2effbfd8713936742ef46e6e85ce193b320ac005 from PHP-8.0.

The issues these commits fix could also manifest in PHP 7.4, and
a commenter on bug #80307 reports this this might indeed be
happening.

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