Canada does this too. Don’t most countries?

I do not think so. It varies a lot. The last time I looked at UK law you were liable for CGT for a long time after you left the country just to stop people leaving for a short time to evade CGT, but it was not the case a few decades ago.

With all countries you need to check the provisions of double tax treaties. There is likely to be somewhere that has no or low CGT that has a double tax treaty with where-ever you are that lets you dodge this sort of provision (at least partly).

Then there are things like using trusts (another thing you could get away with in the UK that got cracked down on in recent decades).