Memory objects getting lost

I looked up ToolTipLast. The ToolTipLast I found is available under MemoryMeasurementAccu. The properties under MemoryMeasurementAccu are not read from memory but derived from the memory measurement which is available under MemoryMeasurement. The Accu part of the symbol stands for accumulation, as the properties in there are an accumulation of what was part of the memory measurement in the past.
So, to see where the value of ToolTipLast is coming from, I see no need to consider contents of the EVE Online client. I would follow the code in the Framework which assigns to this property:

In the screenshot, I do not see the complete path, maybe the screenshot is clipped at the top. My guess is that the path is under MemoryMeasurementAccu. Because of this, I would not expect the properties in there to reflect what is on the Screen in the EVE Online client. So there is not yet a connection to even when hovered mouse over.

To see what is on the Screen in the EVE Online client, look under the properties under the node MemoryMeasurement. The ship module tooltip is at MemoryMeasurement.Value.ModuleButtonTooltip.

To clarify this, I wrote a guide at Sanderling Framework - Differences between MemoryMeasurement, MemoryMeasurementParsed and MemoryMeasurementAccu