I want to know why tags I expect (for example lcp.element) do not appear in the Suspect Tags section on the Transaction Summary.
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Suspect Tags is not a complete list of every tag on the transaction. It lists tag keys and values that often correspond to slower transactions for that name, sorted by total time lost. See Suspect Tags.

Do not confuse this with Suspect Spans, which highlights spans where most of the transaction time is spent.

For a broader tag breakdown on the same page, use the Tag Summary (facet map) in the sidebar and the Tags tab.

Sentry shows at most 20 tags across Suspect Tags and Other Tags combined. If more tags qualify, some will not appear in that combined list.