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They fixed it internally. We will see the fix with the next sim/world update only unless they make up their mind to come up with a hotfix.I've just tried to add a taxiway this morning and as far as I can tell nothing's changed. The blog says they fixed a problem where taxiway lines were not appearing.
Perhaps in the process of fixing that they screwed up the taxiways appearing during development.
As Muffow said you can force them to appear by adding a parking point or gate.