Multiple masters bug: edits to one of the masters transforms to the other master

I’m on 3.4.1, my colleague who I’m collaborating with is on the same version.

There are no issues on their end when I share a file for them to work on. However, for the past couple days (no new updates on either end, to my knowledge) any file my colleague shares with me has this bug: one master (#1) works like normal. The other master (#2), however, also displays the curves for master #1. I can select the nodes on the opposing masters, but can not delete them. Any edits transform to the opposing master (which makes editing curves highly impractical). If I use ctrl+option while editing, the corresponding point in master #1 moves to the same position as the point I’m editing.

What might be the problem?

Make sure you don’t have the Multi-Selection tool active. Use the normal Select Tool (V).

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Are they using certain scripts or plugins to process the font file?

This can happen if an automation sets one layer to another rather than making an object copy first.

This was the issue, actually. My oversight. When the multi-selection is active, it seems it stays the primary mode when using V as the hotkey. Which is probably intended behavior, just me not used to the multi-select tool being available. Thanks for clarifying!