I’ve managed team members in many European countries; we only count days you’d otherwise work. (We do have one every 5 year sabbatical program that is “4 weeks, and if there was a company holiday in that stretch, you don’t get an extra day”, but otherwise, taking 4 M-F stretches is 4x5 = 20 days of PTO.

Which countries do it like this? At least at where I've worked in the UK, only the days where you would've normally been at work are counted.

Based on the downvotes and replies, I'd say this is not true.

You're wrong for the case of the Netherlands and Belgium.