std.Progress: fix race assertion failure #20269
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A node may be freed during the execution of this loop, causing there to be a parent reference to a nonexistent node. Without this assignment, this would lead to the map entry containing stale data. By assigning none, the child node with the bad parent pointer will be harmlessly omitted from the tree. Closes #20262
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A node may be freed during the execution of this loop, causing there to
be a parent reference to a nonexistent node. Without this assignment,
this would lead to the map entry containing stale data. By assigning
none, the child node with the bad parent pointer will be harmlessly
omitted from the tree.
Closes #20262