If the EU patent is revoked in court in EU, the court in other country almost certainly will revoke the equivalent patent in their country because the precedent.
Which other country? Surely you dont mean for EU member states, since the patent would now be cancelled.
For other countries, with different legal systems? The ruling wouldn't be binding as precedent of foreign courts doesn't bind and the law on what makes a valid patent is different. Maybe it looks kind of bad, but so does cancelling your patents right before they are ruled invalid.
IANAL, but precedents are generally not binding in Europe (Poland at least) - they just serve as an argument. From that perspective it doesn’t matter much if it’s the same or a different country.
