550 oil pump chain and guide problem

Hi!
I’ve done big service with timing belt, all bearings in timing gears and oil pump chain+guides in 550. Bearings and chain was changed because of the rattle noise from its location.
After few km done rattle came back. After inspection I found out that shoe guide is damaged (silver one on the right).

I’m wondering if it’s my mistake or low quality of parts. Everyting was new OE parts.
Workshop manual doesn’t say anything about adjusting play on that chain.

I’ll be appreciate for comments.

The car is 1998 550 Maranello.

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