timeline missing information/update when items are shared with the board

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Is your feature request related to a problem? Please describe.
I'm always frustrated when I want to check the timeline of a board, and do not find information about recent relations to it as a project relation from other cards, i.e. Sharing information

Steps to reproduce the behavior

• add a card to another project/board
• Open that board's timeline
• See that the timeline does not report the Sharing information

Describe the solution you'd like
If I check the timeline for what happened on the board, I expect sharing information to be part of it, and sorted into the timeline at the respective chronological point.

Describe alternatives you've considered
click extra and see information about the Sharing, but then missing information about it in the chronological context.

Start by locating the board timeline implementation and the handling of card-sharing events. Reproduce the issue by adding a card to another board and comparing the timeline with the Sharing details; done means the sharing event appears in its chronological position.