Ctrl-Z sometimes undo'es multiple changes

[MarkusNaeher]

I'm using OpenSCAD Version 2021.01-6 on Arch Linux.

When I have a long editing session, OpenSCAD sometimes switches to Ctrl-Z undoing multiple changes. "switches to" means that once it has started, it only returns to normal when I close and reopen OpenSCAD.
It looks like the point where Ctrl-Z returns to is always the same within one session. This means that no state between that one and the latest one can be restored. This is especially bad when I want to undo a deletion.

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[bjohas]

I have this issue too (OpenSCAD version 2021.01, Ubuntu)