Why is my tax-advantaged plan missing from the summary?

That is deliberate, and it is in your interest.

A French PEA, and equivalent plans, are not taxed transaction by transaction. As long as you take no money out of the plan, your purchases and sales inside it have no tax consequence: there is nothing to report. Tax is triggered only on withdrawal, and it applies to the overall gain of the plan since it was opened, not to any individual sale.

On top of that, for plans opened before 2018 the calculation depends on rates that vary according to the period in which the gain built up. That information appears nowhere in your transaction history: only your bank holds it, and it is given to you on your annual tax statement.

Earnnest therefore prefers to exclude such plans clearly rather than display an approximate figure. For withdrawals, rely on the document supplied by your bank.

The same principle applies to life-insurance wrappers, retirement plans and crypto-assets, which fall under separate rules.