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This is a bug (#54869) with no workaround other than hardcoding the layer. An alternative to using the native (C++) Geometry By Expression tool is to modify the old python Geometry By Expression tool from QGIS 3.10 and add the missing layer scope to the expression context using QgsExpressionContextUtils.layerScope.
As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.