I find the whole idea of "entitlement" to unpaid leave very strange.
When you work for an employer, you're selling your labour for an agreed amount of money. Your sale is either for a specific workload (ie, per project) or a certain amount of time (ie, per diem). Some jobs are a combination, in which case the 'per diem' is the salary and 'project' pay comes as a bonus.
If you're on a salary, you can calculate your weekly, daily and hourly pay. This works because you are being paid for your time.
Therefore, it's utterly reasonable to say "Hey, Employer, I'm going to reduce the amount of time you're buying. Of course you won't have to pay me for the days I'm not working."
It's not being entitled, it's being perfectly rational. Assuming you work in a team with workflows and objectives, you'll need to arrange your times off so the work still flows and the objectives are met.
Some people seem to think you get paid for being there rather than the work you do. I once had a manager who actually made me sit for hours doing nothing as I "worked too quickly" 👀 That attitude was bonkers back then, and it still is!