why glue points on MathType formula are invisible?

Hi,
I want to use glue points and connectors in DRAW to show relations between variables in my MathType formulas. But all glue points become invisible after placement. What`s wrong with me or Libre? Everything is OK with non-OLE objects. Is it a reason for the problem?

There are a few bug reports related: maybe fdo#106621 the more interesting.

As a workaround, you can convert the formula to curves (menu Shape - Convert - To Curve), ungroup it (menu Shape - Group - Ungroup), combine it (menu Shape - Combine).


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